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【单选题】
在某工程网络计划中，工作M的最迟完成时间为第30天，某持续时间为7天。工作M有3项紧前工作，他们的最早完成时间分别为第13天、第15天和第17天，则工作M的总时差为( )天。A.
17
B.
13
C.
10
D.
6
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