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【单选题】
在上图所示双代号时标网络计划中，如果C、E、H三项工作因共用一台机械而必须顺序施工，则该施工机械在现场的最小闲置时间为（ ）。A.
4
B.
3
C.
2
D.
1
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【单选题】The writer's father believed that ______.
A.
you should only do things for which you have the ability
B.
only important jobs are worth doing well
C.
you should only attempt worthwhile jobs
D.
anything you do should be done to your best ability
【简答题】Do you have a pen pal? If not, do you want to have one? Now let me tell you how to get a pen pal. There are usually three steps(步骤)The first is greeting. In this step, you and your new friend will say...
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