题目内容

(四)
某项目由8项活动(A、B、C、D、E、F、G、H)组成,其网络图见下图,各活动的工期(单位:天)均已在图中标出。
90.该项目的网络图表明()。

A和B完成之后,E才能开始
B. D必须在E之前完成
C. B、D完成之后,F才能开始
D和G可以同时开始

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