某钢筋混凝土基础工程，包括知模板、绑扎钢筋、浇筑混凝土三道工序。每道工序安排一个专业施工队进行，分三段施工，各工序在一个施工段上的作用时间分别3天、2天、1天，关于其施工网络计划的说法，正确的有（）。
A.节点⑤的最早时间是5
B.工作①~②是关键工作
C.需工作③~⑤是多余的
D.只有1条关键线路
E.工作⑤~⑥是非关键工作
参考答案：B, D, E
| Cloze test. 完形填空。 |
| Li Lei: Look l this toy car, Lucy. It's a new car. Is it 2 ? Lucy: No, it isn't. 3 is at home. I think 4 Lily's. She can't find 5 car. Li Lei: Excuse me, Lily. Is this 6 car? Lily: Let 7 see. Oh, yes, it's 8 . Li Lei: Here you are. You must look after 9 . Lily: Yes. 10 a lot, Li Lei. Li Lei: That's OK. |
| ( ) 1. A. on ( ) 2. A. you ( ) 3. A. Mine ( ) 4. A. its ( ) 5. A. her ( ) 6. A. your ( ) 7. A. me ( ) 8. A. my ( ) 9. A. its ( ) 10. A. thank | B. at B. yours B. Ours B. it's B. she B. you B. we B. mine B. it B. thanks | C. of C. your C. Your C. they C. theirs C. our C. my C. your C. it's C. Thanks | D. in D. his D. Their D. her D. its D. ours D. us D. me D. them D. Thank |