单选题:在某工程双代号网络计划中,如果以某关键节点为完成节点的工作有3项,则该3项工作(  )。

题目内容:
在某工程双代号网络计划中,如果以某关键节点为完成节点的工作有3项,则该
3项工作(  )。 A.全部为关键工作
B.至少有一项为关键工作
C.自由时差相等
D.总时差相等

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