电除尘器投运前应检查接地装置良好,其高压系统接地电阻应小于()。
参考答案:1Ω
从方框中选择合适的选项完成对话(其中有两项多余)。
A: What do you do on weekends?
B: 1
A: To the movies?
B: Yes. What about you?
A: 2
B: How often do you surf the Internet?
A: 3 It's very nice.
B: What do you do on the Internet?
A: I usually chat with my friends. 4
B: Yes. It's 43505891.
A: 5 We can talk on the Internet.
----You failed again in the maths exam yesterday.
----Don’t tell Dad about it; if he knows that ,I’m dead.
A.as well as
B.as good as
C.as possible as
D.as far as