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【单选题】
下面不正确的说法是 。 (1)在AOE网中,减小一个关键活动上的后,整个工期也就相应减小; (2)AOE网工程工期为关键活动上的权之和; (3)在关键路径上的活动都是关键活动,而关键活动也必在关键路径上。A.
（1）
B.
（2）
C.
（3）
D.
（1）、（2）
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