单选题:某双代号时标网络如下图所示(单位:天),下列说法不正确的是( )。

题目内容:
某双代号时标网络如下图所示(单位:天),下列说法不正确的是( )。
A.关键线路是C→E→J→M
A.关键线路是C→E→J→M
B.工作B的总时差和自由时差均为2天
B.工作B的总时差和自由时差均为2天
C.工作I的自由时差为0
C.工作I的自由时差为0
D.若工作D拖延2天,总工期不受影响
D.若工作D拖延2天,总工期不受影响
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答案解析:

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