卷扬机装配后制动器摩擦衬垫与制动轮工作表面、离合器两接合面的接触斑点分布面积应不小于理论接触面积的()。
A、60%
B、70%
C、80%
D、90%
参考答案:C
根据要求写出句子
1. My father wants to buy a bottIe of milk. (写成否定句)
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2. I can find out the weather on TV. (对画线部分提问)
3. I bought three CDs. (改为一般疑问句)
4. He can use his computer now. (改为否定句)
5. They are on Shelf C. (对画线部分提问)