道岔()的作用是增强尖轨的框架作用,提高尖轨的稳定性。
参考答案:(连接杆)
完成对话,每空一词。
A: Hello?
B: Hello. May I 1______ to Helen, please?
A: Yes, speaking. Who is 2______, please?
B: This is Jane. I am calling from my new home.
A: Your new home? Where?
B: It is near Xinjiekou. The street is busy and I can see so many beautiful buildings on the street.
A: Is it big?
B: No. It is quite 3______. It has only a bedroom, a dining room and a kitchen.
A: How can I get there?
B: You can 4______ the No.106 bus.
A: That's great! What's your telephone 5______?
B: It is 8996 3265.
A: OK. I will go to visit you when I am free. Goodbye.
B: Goodbye.
进度控制的主要工作环节是()。
A.采取纠偏措施
B.进度控制工作的任务分工
C.设计方案竞选
D.进度控制的手段