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网络计划中,关于最早开始时间和最早完成时间描述不正确的一项是(        )。

a. 最早开始时间是在紧前工作的约束下,本工作有可能开始的最早时刻
b. 最早开始时间从网络计划的起点节点开始,顺序进行计算
c. 最早完成时间是在紧前工作的约束下,本工作有可能完成的最早时刻
d. 工作最早完成时间等于该工作最早开始时间与其持续时间之差
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