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【多选题】
在某工程网络计划中，已知工作M的自由时差为3天。如果在该网络计划的执行过程中发现工作M的持续时间延长了2天，而其他工作正常，则此时工作M( )。A.
不会使总工期延长
B.
不影响其后续工作的正常进行
C.
总时差不变，自山时差减少2天
D.
总时差和自由时差各减少2天
E.
自由时差不变，总时差减少2天
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【简答题】Thousands of years ago, ten of our very distant ancestors were hungry. They went out and picked berries or dug up roots to eat. Four of them chose poisonous food and died. The remaining six noticed th...
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【单选题】Thousands of years ago, ten of our very distant ancestors were hungry. They went out and picked berries or dug up roots to eat. Four of them chose poisonous food and died. The remaining six noticed th...
A.
Habit—a Barrier to Progress
B.
The Survival of Mankind
C.
Various Patterns of Human Behavior
D.
We Are Creatures of Habit
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【单选题】How did researchers know that ancient Greeks rushed to watch the Olympics?
A.
Thousands of people came to watch.
B.
The main stadium is still not big enough.
C.
They have found the related record of events.
D.
Many of them were visitors and pilgrims.
【简答题】已知：如图，直线 交⊙O于A、B两点，AE是⊙O的直径，点C为⊙O上一点，且AC平分∠PAE，过C作 于D. 小题1:求证：CD为⊙O的切线； 小题2:若DC+DA=6，⊙O的直径为10，求AB的长.
【简答题】写出图(a)梯形图编程的指令表编程，并画出程序运行时的时序波形图。
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