{"id":165,"date":"2022-09-22T10:41:39","date_gmt":"2022-09-22T02:41:39","guid":{"rendered":"https:\/\/h4ckm310n.com\/?p=165"},"modified":"2024-12-14T19:37:43","modified_gmt":"2024-12-14T11:37:43","slug":"%e8%9a%82%e8%9a%81%e9%9b%86%e5%9b%a2%e7%a7%8b%e6%8b%9b%e7%ac%94%e8%af%95-20220922","status":"publish","type":"post","link":"https:\/\/h4ckm310n.com\/?p=165","title":{"rendered":"\u8682\u8681\u96c6\u56e2\u79cb\u62db\u7b14\u8bd5 – 20220922"},"content":{"rendered":"

<\/p>\n

\u5355\u9009\u9898<\/h3>\n

1. \u8fdb\u7a0b\u662fLinux\u7cfb\u7edf\u4e2d\u7684\u57fa\u672c\u6982\u5ff5\u3002\u8fdb\u7a0b\u7ba1\u7406\u662fLinux\u7cfb\u7edf\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u4e00\u90e8\u5206\u5185\u5bb9\uff0c\u4e0b\u5217\u9009\u9879\u4e2d\uff0c\u5173\u4e8eLinux\u7cfb\u7edf\u8fdb\u7a0b\u548c\u8fdb\u7a0b\u7ba1\u7406\u7684\u6709\u5173\u7ed3\u8bba\uff0c\u6b63\u786e\u7684\u662f
\nA. Linux\u7528\u6237\u6001\u4e2d\u7ef4\u62a4\u7740\u4e00\u5f20\u8868\uff0c\u91cc\u9762\u8bb0\u5f55\u4e86\u5f53\u524d\u7cfb\u7edf\u8fd0\u884c\u7684\u6240\u6709\u8fdb\u7a0b\u76f8\u5173\u4fe1\u606f
\nB. Linux\u4f1a\u7efc\u5408\u8003\u8651\u5404\u79cd\u56e0\u7d20\u51b3\u5b9a\u8fdb\u7a0b\u7684\u4f18\u5148\u7ea7\uff0c\u65e0\u6cd5\u4eba\u5de5\u5e72\u9884
\nC. Linux\u7cfb\u7edf\u4e2d\u8c26\u8ba9\u5ea6\u4f4e\u7684\u8fdb\u7a0b\u4f1a\u66f4\u65e9\u5730\u88abCPU\u8fdb\u884c\u5904\u7406
\nD. Linux\u7cfb\u7edf\u4e2d\u8fdb\u7a0b\u6709\u591a\u4e2a\u5c5e\u6027\u53c2\u6570\uff0c\u5176\u4e2dPPID\u4ee3\u8868\u5f53\u524d\u8fdb\u7a0b\u7684ID<\/p>\n

2. \u73b0\u6709\u4e00\u5f20\u8868school\uff0c\u73b0\u5728\u8981\u4e3a\u8be5\u8868\u7684’username’\u5b57\u6bb5\u548c’age’\u5b57\u6bb5\u521b\u5efa\u8054\u5408\u7d22\u5f15\uff0c\u4ee5\u4e0b\u8bed\u53e5\u6b63\u786e\u7684\u662f
\nA. CREATE UNIQUE INDEX test_index ON SCHOOL(username) and SCHOOL(age);
\nB. CREATE INDEX test_index ON SCHOOL(username) and SCHOOL(age);
\nC. CREATE INDEX test_index ON SCHOOL(username, age);
\nD. \u5176\u5b83\u9009\u9879\u90fd\u4e0d\u6b63\u786e<\/p>\n

3. \u5728Redis\u4e2d\uff0c\u6211\u4eec\u628a\u8bbf\u95ee\u9891\u7387\u9ad8\u7684key\uff0c\u79f0\u4e3a\u70ed\u70b9key\u3002\u4e0b\u5217\u5173\u4e8e\u70ed\u70b9key\u7684\u8bf4\u6cd5\uff0c\u4e0d\u6b63\u786e\u7684\u662f
\nA. \u7528\u6237\u6d88\u8d39\u7684\u6570\u636e\u8fdc\u5927\u4e8e\u751f\u4ea7\u7684\u6570\u636e\uff0c\u4f1a\u4ea7\u751f\u70ed\u70b9key
\nB. \u8bf7\u6c42\u5206\u7247\u96c6\u4e2d\uff0c\u8d85\u8fc7\u5355Redis\u670d\u52a1\u5668\u7684\u6027\u80fd\uff0c\u4f1a\u9020\u6210\u70ed\u70b9key\u95ee\u9898
\nC. \u70ed\u70b9key\u95ee\u9898\u4f1a\u5f15\u53d1\u7f13\u5b58\u96ea\u5d29
\nD. \u4f7f\u7528\u4e8c\u7ea7\u7f13\u5b58\uff0c\u5373JVM\u672c\u5730\u7f13\u5b58\uff0c\u51cf\u5c11Redis\u7684\u8bfb\u8bf7\u6c42\uff0c\u53ef\u4ee5\u7f13\u89e3\u70ed\u70b9key\u95ee\u9898<\/p>\n

4. \u73b0\u5728\u6709\u4e00\u4e2a\u6570\u5217\uff1a[1,1,1,1,0,1,1,1,0,1,1]\uff0c\u4f60\u6bcf\u6b21\u64cd\u4f5c\u53ef\u4ee5\u5c06\u4e00\u4e2a\u6570\u5b571\u6539\u4e3a0\uff0c\u73b0\u5728\u8981\u6c42\u4efb\u610f\u4f4d\u7f6e\u4e0d\u80fd\u51fa\u73b0\u8fde\u7eed\u7684\u4e09\u4e2a1\uff0c\u8bf7\u95ee\u4f60\u81f3\u5c11\u8fdb\u884c\uff08\uff09\u6b21\u4fee\u6539\u64cd\u4f5c\u624d\u80fd\u8ba9\u6570\u5217\u6ee1\u8db3\u4e0a\u8ff0\u6761\u4ef6\u3002
\nA. 1
\nB. 2
\nC. 3
\nD. 4<\/p>\n

5. Linux\u7cfb\u7edf\u4e2d\u7ba1\u7406\u5458\u9700\u8981\u5b9a\u671f\u5bf9\u5f53\u524d\u767b\u5f55\u7684\u7528\u6237\u6570\u8fdb\u884c\u7ba1\u7406\u3002\u7ed9\u5b9a\u5982\u4e0b\u9700\u6c42\uff0c\u5982\u679c\u67d0\u4e2a\u7cfb\u7edf\u4e2d\u5f53\u524d\u7528\u6237\u7684\u6570\u91cf\u5c0f\u4e8e100\uff0c\u5219\u8f93\u51fa\u201cYES\u201d\uff0c\u4e0b\u5217\u9009\u9879\u4e2d\uff0c\u6b63\u786e\u7684\u547d\u4ee4\u662f
\nA. [`who | wc -l` -le 100] && echo “yes”
\nB. [`which | wc -l` -le 100] && echo “yes”
\nC. [`who | wc -w` -le 100] && echo “yes”
\nD. [`which | wc -c` -le 100] && echo “yes”<\/p>\n

6. \u5df2\u77e5\u5173\u952e\u5b57\u5e8f\u52176,9,13,20,29,21,16,24\u662f\u5c0f\u6839\u5806\uff0c\u63d2\u5165\u5173\u952e\u5b574\uff0c\u8c03\u6574\u597d\u540e\u5f97\u5230\u7684\u5c0f\u6839\u5806\u662f
\nA. 4,6,13,9,29,21,16,20,24
\nB. 4,6,13,9,29,21,16,24,20
\nC. 4,6,9,29,13,21,16,24,20
\nD. 4,6,9,13,29,21,16,24,20<\/p>\n

\u591a\u9009\u9898<\/h3>\n

1. \u7ed9\u5b9a\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff1aA-B*C+D\/B\uff0c\u5982\u679c\u8868\u8fbe\u5f0f\u4e3a\u6570\u6216\u7b80\u5355\u53d8\u91cf\uff0c\u5219\u76f8\u5e94\u4e8c\u53c9\u6811\u4e2d\u53ea\u6709\u4e00\u4e2a\u6839\u7ed3\u70b9\uff0c\u5176\u6570\u636e\u57df\u5b58\u653e\u8be5\u8868\u8fbe\u5f0f\u81ea\u5df1\uff1b\u5982\u679c\u8868\u8fbe\u5f0f=(\u7b2c\u4e00\u64cd\u4f5c\u6570)(\u8fd0\u7b97\u7b26)(\u7b2c\u4e8c\u64cd\u4f5c\u6570)\uff0c\u5219\u76f8\u5e94\u7684\u4e8c\u53c9\u6811\u4e2d\u5de6\u5b50\u6811\u8868\u793a\u7b2c\u4e00\u64cd\u4f5c\u6570\uff0c\u53f3\u5b50\u6811\u8868\u793a\u7b2c\u4e8c\u64cd\u4f5c\u6570\uff0c\u6839\u7ed3\u70b9\u7684\u6570\u636e\u57df\u5b58\u653e\u8fd0\u7b97\u7b26\u3002\u4e0b\u5217\u53d9\u8ff0\u6b63\u786e\u7684\u6709\uff08\uff09\uff0c\u6784\u5efa\u7684\u4e8c\u53c9\u6811\u6839\u8282\u70b9\u4e3a+\u3002
\nA. \u8868\u8fbe\u5f0f\u7684\u4e8c\u53c9\u6811\u4e3a\uff1a
\n\"\"
\nB. \u8be5\u8868\u8fbe\u5f0f\u7684\u6ce2\u5170\u5f0f\uff1a+-A*B\/CDE
\nC. \u8be5\u8868\u8fbe\u5f0f\u7684\u4e2d\u7f00\u8868\u793a\uff1aA-B*C+D\/E
\nD. \u8be5\u8868\u8fbe\u5f0f\u7684\u9006\u6ce2\u5170\u5f0f\uff1aABC*-DE\/+<\/p>\n

2. \u4e0b\u5217\u662f\u6709\u5173\u7f13\u51b2\u533a\u7684\u4e00\u4e9b\u63cf\u8ff0\uff0c\u8bf4\u6cd5\u6b63\u786e\u7684\u662f
\nA. \u7f13\u51b2\u533a\u662f\u4ecb\u4e8e\u9ad8\u901f\u8bbe\u5907\u548c\u4f4e\u901f\u8bbe\u5907\u4e4b\u95f4
\nB. \u7f13\u51b2\u533a\u53ef\u4ee5\u5b58\u653e\u4f4e\u901f\u8bbe\u5907\u4f20\u9012\u7ed9\u9ad8\u901f\u8bbe\u5907\u7684\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u5728\u4f4e\u901f\u8bbe\u5907\u4e0d\u4e00\u5b9a\u6709\u5907\u4efd
\nC. \u7f13\u51b2\u533a\u53ef\u4ee5\u5b58\u653e\u4f4e\u901f\u8bbe\u5907\u4f20\u9012\u7ed9\u9ad8\u901f\u8bbe\u5907\u7684\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u5728\u4f4e\u901f\u8bbe\u5907\u4e00\u5b9a\u6709\u5907\u4efd
\nD. \u9ad8\u901f\u8bbe\u5907\u548c\u4f4e\u901f\u8bbe\u5907\u7684\u901a\u4fe1\u90fd\u8981\u7ecf\u8fc7\u7f13\u51b2\u533a<\/p>\n

3. \u4e0b\u5217\u5173\u4e8e\u6b7b\u9501\u5904\u7406\u65b9\u6cd5\u7684\u53d9\u8ff0\u6b63\u786e\u7684\u6709
\nA. \u6b7b\u9501\u7684\u9884\u9632\u8f83\u4e3a\u4fdd\u5b88\uff0c\u5b81\u53ef\u8d44\u6e90\u95f2\u7f6e
\nB. \u6b7b\u9501\u7684\u907f\u514d\u662f\u5728\u8fd0\u884c\u65f6\u5224\u65ad\u662f\u5426\u53ef\u80fd\u6b7b\u9501\uff0c\u4f46\u662f\u5fc5\u987b\u77e5\u9053\u5c06\u6765\u7684\u8d44\u6e90\u8bf7\u6c42
\nC. \u6b7b\u9501\u7684\u68c0\u6d4b\u5141\u8bb8\u5bf9\u6b7b\u9501\u8fdb\u884c\u73b0\u573a\u5904\u7406
\nD. \u6b7b\u9501\u7684\u907f\u514d\u53ef\u80fd\u4f1a\u4f7f\u8fdb\u7a0b\u957f\u65f6\u95f4\u963b\u585e<\/p>\n

4. \u4e32\u662f\u7531\u96f6\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u7ec4\u6210\u7684\u6709\u9650\u5e8f\u5217\uff0c\u4e0b\u5217\u5173\u4e8e\u4e32\u7684\u5b58\u50a8\u7ed3\u6784\u7684\u53d9\u8ff0\u6b63\u786e\u7684\u6709
\nA. \u7528\u4e8e\u7ebf\u6027\u8868\u7684\u5b58\u50a8\u7ed3\u6784\u4e5f\u9002\u7528\u4e8e\u4e32
\nB. \u4e32\u7684\u5b9a\u957f\u987a\u5e8f\u5b58\u50a8\u7ed3\u6784\u4e2d\u4e32\u7684\u5b58\u50a8\u7a7a\u95f4\u5728\u7f16\u8bd1\u65f6\u5b8c\u6210\uff0c\u4e0d\u53ef\u66f4\u6539
\nC. \u4e32\u7684\u52a8\u6001\u5b58\u50a8\u7ed3\u6784\u4e0b\u4e32\u7684\u5b58\u50a8\u7a7a\u95f4\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u5206\u914d
\nD. \u4e32\u7684\u94fe\u5f0f\u5b58\u50a8\u7ed3\u6784\u548c\u5806\u7ed3\u6784\u7684\u5b58\u50a8\u65b9\u5f0f\u90fd\u5c5e\u4e8e\u4e32\u7684\u52a8\u6001\u5b58\u50a8\u7ed3\u6784<\/p>\n

5. \u4e0b\u5217\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u54ea\u4e9b\u662f\u7ebf\u6027\u7ed3\u6784
\nA. \u961f\u5217
\nB. Map\u96c6\u5408
\nC. \u6808
\nD. \u4e8c\u53c9\u6811<\/p>\n

6. TCP\u662f\u9762\u5411\u8fde\u63a5\u7684\u8fd0\u8f93\u5c42\u534f\u8bae\u3002\u5047\u8bbe\u6709\u4e24\u4e2a\u5408\u4f5c\u65b9\uff0c\u5206\u522b\u662f\u5408\u4f5c\u65b91\u4e0e\u5408\u4f5c\u65b92\uff0c\u4ed6\u4eec\u5f7c\u6b64\u4e4b\u95f4\u9700\u8981\u53d1\u9001\u62a5\u6587\uff0c\u5176\u521d\u59cb\u7684\u5e8f\u5217\u53f7\u5206\u522b\u4e3aA\u548cB\uff0c\u5176\u4e2d\u5408\u4f5c\u65b91\u7ed9\u5408\u4f5c\u65b92\u53d1\u9001\u7684\u62a5\u6587\u4e3aSYN=1\uff0c\u5e8f\u53f7=A\uff08\u7b2c\u4e00\u6b21\u63e1\u624b\uff09\uff0c\u5408\u4f5c\u65b92\u63a5\u6536\u5230\u62a5\u6587\u540e\u4e5f\u9700\u8981\u53d1\u9001\u62a5\u6587\u7ed9\u5408\u4f5c\u65b91\uff08\u7b2c\u4e8c\u6b21\u63e1\u624b\uff09\uff0c\u6700\u540e\u5408\u4f5c\u65b91\u518d\u6b21\u53d1\u9001\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u4fbf\u548c\u5408\u4f5c\u65b92\u5efa\u7acb\u4e86\u8fde\u63a5\uff08\u7b2c\u4e09\u6b21\u63e1\u624b\uff09\uff0c\u5176\u4e2dACK\u7684\u62ec\u53f7\u90e8\u5206\u4ee3\u8868\u634e\u5e26\u7684\u5e8f\u53f7\uff0c\u4e0b\u5217\u9009\u9879\u4e2d\uff0c\u5bf9\u4e8e\u7b2c\u4e8c\u6b21\u63e1\u624b\u65f6\u5bf9\u5e94\u7684\u62a5\u6587\u4fe1\u606f\uff0c\u9519\u8bef\u7684\u9009\u9879\u662f
\nA. SYN=1\uff0c\u5e8f\u53f7=A+1
\nB. SYN=1\uff0c\u5e8f\u53f7=A+1\uff0cACK(A)=1
\nC. SYN=1\uff0c\u5e8f\u53f7=B\uff0cACK(A+1)=1
\nD. SYN=1\uff0c\u5e8f\u53f7=B\uff0cACK(B+1)=1<\/p>\n

\u7b97\u6cd5\u9898<\/h3>\n

1. \u5c0f\u7ea2\u7684\u533a\u95f4\u67e5\u8be2<\/h4>\n

\u9898\u76ee\u63cf\u8ff0\uff1a
\n\u5c0f\u7ea2\u62ff\u5230\u4e86\u4e00\u4e2a\u4ec5\u7531\u6b63\u6574\u6570\u7ec4\u6210\u7684\u6570\u7ec4\uff0c\u5979\u6709\u4ee5\u4e0b\u4e24\u79cd\u64cd\u4f5c\uff1a
\n1. \u8f93\u51651 i x\uff0c\u4ee3\u8868\u5c06\u7b2ci\u4e2a\u6b63\u6574\u6570\u4fee\u6539\u4e3ax\u3002
\n2. \u8f93\u51652 i x\uff0c\u4ee3\u8868\u67e5\u8be2\u524di\u4e2a\u6b63\u6574\u6570\u6709\u591a\u5c11\u4e2a\u6570\u7b49\u4e8ex\u3002<\/p>\n

\u8f93\u5165\u63cf\u8ff0\uff1a
\n\u7b2c\u4e00\u884c\u8f93\u5165\u4e24\u4e2a\u6b63\u6574\u6570n\u548cq\uff0c\u4ee3\u8868\u6570\u7ec4\u957f\u5ea6\u548c\u64cd\u4f5c\u6b21\u6570\u3002
\n\u7b2c\u4e8c\u884c\u8f93\u5165\u51e0\u4e2a\u6b63\u6574\u6570ai\uff0c\u4ee3\u8868\u521d\u59cb\u7684\u6570\u7ec4\u3002
\n\u63a5\u4e0b\u6765\u7684q\u884c\uff0c\u6bcf\u884c\u8f93\u5165\u4e09\u4e2a\u6b63\u6574\u6570op,i,x\uff0c\u7528\u7a7a\u683c\u9694\u5f00\uff0c\u5176\u4e2dop\u4ee3\u8868\u64cd\u4f5c\u7684\u7c7b\u578b\uff0ci\u548cx\u7684\u542b\u4e49\u89c1\u9898\u76ee\u63cf\u8ff0\u3002
\n1\u2264n,q,ai,x\u2264200
\n1\u2264op\u22642
\n1\u2264i\u2264n
\n\u4fdd\u8bc1\u81f3\u5c11\u67091\u6b21\u8be2\u95ee\u64cd\u4f5c\u3002<\/p>\n

\u8f93\u51fa\u63cf\u8ff0\uff1a
\n\u5bf9\u4e8e\u6bcf\u6b21\u8be2\u95ee\uff0c\u8f93\u51fa\u4e00\u4e2a\u6574\u6570\uff0c\u4ee3\u8868\u67e5\u8be2\u7684\u7ed3\u679c\u3002<\/p>\n

\u793a\u4f8b1\uff1a
\n\u8f93\u5165\uff1a
\n5 3
\n1 2 3 4 5
\n2 3 1
\n1 1 2
\n2 3 1
\n\u8f93\u51fa\uff1a
\n1
\n0<\/p>\n

\u8bf4\u660e\uff1a
\n\u7b2c\u4e00\u6b21\u4e3a\u67e5\u8be2\u64cd\u4f5c\uff0c\u6b64\u65f6\u6570\u7ec4\u4e3a[1,2,3,4,5]\uff0c\u524d\u4e09\u4e2a\u6570\u4e2d\u6709\u4e00\u4e2a1\u3002
\n\u7b2c\u4e8c\u6b21\u4e3a\u4fee\u6539\u64cd\u4f5c\uff0c\u5c06\u6570\u7ec4\u4fee\u6539\u4e3a[2,2,3,4,5]\u3002
\n\u7b2c\u4e09\u6b21\u4e3a\u67e5\u8be2\u64cd\u4f5c\uff0c\u6b64\u65f6\u6570\u7ec4\u4e3a[2,2,3,4,5]\uff0c\u524d\u4e09\u4e2a\u6570\u4e2d\u6ca1\u67091\u3002<\/p>\n

2. \u5c0f\u7ea2\u7684\u6570\u5b57\u4e32<\/h4>\n

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\n\u5c0f\u7ea2\u62ff\u5230\u4e86\u4e00\u4e2a\u6570\u5b57\u4e32\uff08\u7531’1’~’9’\u7ec4\u6210\uff0c\u4e0d\u542b’0’\uff09\uff0c\u5979\u51c6\u5907\u622a\u53d6\u4e00\u6bb5\u8fde\u7eed\u5b50\u4e32\uff0c\u4f7f\u5f97\u8be5\u5b50\u4e32\u8868\u793a\u7684\u6b63\u6574\u6570\u5c0f\u4e8ek\u3002\u4f60\u80fd\u5e2e\u5979\u6c42\u51fa\u6709\u591a\u5c11\u79cd\u622a\u53d6\u65b9\u6848\u5417\uff1f<\/p>\n

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\n\u7b2c\u4e00\u884c\u8f93\u5165\u4e00\u4e2a\u6570\u5b57\u4e32\uff0c\u957f\u5ea6\u4e0d\u8d85\u8fc7200000\u3002
\n\u7b2c\u4e8c\u884c\u8f93\u5165\u4e00\u4e2a\u6b63\u6574\u6570k\u3002
\n1\u2264k\u226410^9<\/p>\n

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\n\u5c0f\u4e8ek\u7684\u622a\u53d6\u65b9\u6848\u6570\u3002<\/p>\n

\u793a\u4f8b1\uff1a
\n\u8f93\u5165\uff1a
\n1234
\n23
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\n5<\/p>\n

\u8bf4\u660e:
\n\u5171\u67091\uff0c2\uff0c3\uff0c4\uff0c12\u8fd9\u4e94\u79cd\u622a\u53d6\u65b9\u6cd5\u3002<\/p>\n

3. \u5c0f\u7ea2\u7684\u77e9\u9635\u6784\u90202<\/h4>\n

\u9898\u76ee\u63cf\u8ff0\uff1a
\n\u5c0f\u7ea2\u60f3\u8ba9\u4f60\u6784\u9020\u4e00\u4e2an\u884cn\u5217\u7684\u77e9\u9635\uff0c\u77e9\u9635\u4e2d\u7684\u5143\u7d20\u4e3a1\u5230n^2\uff0c\u6bcf\u4e2a\u6570\u53ea\u51fa\u73b01\u6b21\uff0c\u5c0f\u7ea2\u5e0c\u671b\u6bcf\u4e2a2*2\u7684\u5b50\u77e9\u9635\u4e2d\u5143\u7d20\u4e4b\u548c\u5747\u4e3a\u5947\u6570\uff0c\u4f60\u80fd\u5e2e\u5e2e\u5979\u5417\uff1f<\/p>\n

\u8f93\u5165\u63cf\u8ff0\uff1a
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\u8f93\u51fa\u63cf\u8ff0\uff1a
\n\u5982\u679c\u65e0\u89e3\uff0c\u76f4\u63a5\u8f93\u51fa-1\u5373\u53ef\u3002
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\u793a\u4f8b2\uff1a
\n\u8f93\u5165\uff1a
\n2
\n\u8f93\u51fa\uff1a
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