目前采用()越来越普遍,这是由于此除尘器有利于捕集高比电阻粉尘,提高除尘效率。
A.常规极距电除尘器;
B.宽极距电除尘器;
C.棒式电除尘器;
D.立式电除尘器。
参考答案:B
-Can you come and play volleyball with us?
- _________________[ ]
A. Sorry, I can't .I have to finish my homework first.
B. No, I am not. I'm very busy now.
C. Yes, I do. I like it very much.
D. I'm afraid I mustn't. I want to do my homework now.
在世界教育史上杜威被认为是“科学教育学奠基人”。