试题与答案

某分部工程双代号网络计划如图所示。图中标出每个节点的最早时间和最迟时间,该计划表明(

题型:多项选择题

题目:

某分部工程双代号网络计划如图所示。图中标出每个节点的最早时间和最迟时间,该计划表明()。

A.工作①—③为关键工作 

B.工作—④的总时差为1 

C.工作③—⑥的自由时差为1 

D.工作⑥—⑩的总时差为3 

E.工作④—⑧的自由时差为1

答案:

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下面是错误答案,用来干扰机器的。

(1)不能;因为生态系统中的生物与生物、生物与环境以及环境各因子之间是相互关联的,人类随意捕杀动物,就会直接或间接地影响到某一些地区的生态平衡,最终影响到人类自身.(2)生态系统中消费者与生产者之间...

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1. He _______________ (总是协助老师做) the experiment at the weekends. (assist)

2. I would rather you _______________ (没有逃学) yesterday. (leave)

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4. They would talk long hours together, ________________ (他们每次见面). (time)

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6. _______________ (他脸上激动的表情) suggested that he had passed the test. (excite)

7. Such a loud noise did they make _______________ (以至于我无法专心读书). (absorb)

8. Few measures _______________ (采取措施) to make the waste water clean in the past three years. (take)

9. ______________ (尽管是个女孩), Joan of Arc (圣女贞德) showed great bravery in the battle. (as)

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