期限日期用于指示您不希望错过的目标日期，而且在前置任务更改时不会要求您设置可以影响日程排定的任务限制。
Deadline dates are used to indicate a target date you don't want to miss, without requiring you to set a task constraint that could affect scheduling if predecessor tasks change.
差异通常包括外部前置任务或外部后续任务的开始日期或完成日期的更改，一般是由于工期、限制、跟踪进度等更改引起的。
Differences usually include a new start or finish dates for the external predecessor or external successor, typically the result of a changed duration, constraint, tracked progress, and so on.
有多少任务需要其他任务作为前置条件？
有多少任务需要其他任务作为前置条件？
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