题目内容
（请给出正确答案）
[主观题]
As a project is carried out and slack time is consumed on individual tasks, the slack left
over for the remaining tasks is:
A.Insignificant.
B.Reduced.
C.Unchanged.
D.Increased.
E.Doubled.
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通信电源分为基础电源和（） 。
A. 直流电源 B. 交流电源 C. 机架电源 D. UPS
