在接近发电厂、变电站的地网中,应将光缆的金属加强构件接地,避免将高电位引入光缆。
参考答案:错
读对话,选答案。
Amy: When do you get up?
Mike: I get up at 6: 40. I get up early because I have breakfast at home.
Amy: What about weekends?
Mike: Oh, I get up at 9: 00.
Amy: What do you do on the weekends?
Mike: Usually I watch TV and do my homework. Sometimes I go hiking. What about you?
Amy: I often read books.
Mike: Tomorrow is Jan. 1st. Let's go hiking together.
Amy: Great!
1. What's the date today?[ ]
A. It's Jan. 1st.
B. It's Dec. 31st.
2. Amy and Mike will _____________ tomorrow.[ ]
A. watch TV and do homework
B. go hiking
3. Does Mike get up early on weekends? [ ]
A. Yes.
B. No.
4. Mike has breakfast at _____________ on Mondays.[ ]
A. school
B. home
5. Does Amy watch TV on the weekends?[ ]
测量气缸的压缩压力,如加少许机油后,压力上升20PSI以上表示()。
A.活塞环磨损
B.气缸床烧坏
C.气门座烧坏
D.导管磨损