瓦楞纸板的类别主要是依据构成瓦楞板的()的情况来区分的。
A、瓦楞规格
B、瓦楞形状
C、用纸层数
D、尺寸
参考答案:A, B, C
用所给单词的适当形式填空。
1. December is the ________ (twelve) month of a year.
2. As we all know, the silk dress feels ________ (soft).
3. She said to the twins, "Help ________ (you) to some fruit."
4. You should do your homework as ________ (careful) as your sister.
5. The foreign teacher gave us some ________ (advice) on how to learn English.
6. _______ (teach) high school students in a poor mountain village may not sound like fun to you.
以下回路能用隔离开关断开的是()。
A.有故障的避雷器
B.有故障的互感器
C.10kV、5km以内的空载输电线路
D.35kV、3200kVA及以下的空载变压器