相对热轧而言，冷轧的优点是（）。
A．表面质量好、尺寸精度高
B．易于轧制变形
C．轧制中可采用大的变形量
D．不产生加工硬化
参考答案：A
句型转换。
根据要求改写句子，每空一词，含缩略形式。
1. My favorite player is Liu Xiang. (对划线部分提问)
________ ________ your favorite player?
2. I have a toothache.(对划线部分提问)
________ ________ with you?
3. They will leave for Beijing tomorrow.(改为一般疑问句)
_________ _________ leave for Beijing tomorrow?
4. Lucy is going to be a dancer. ( 改为否定句)) .
_________________________________________________
5. You'd better go to see your friend now.(改为否定句)
You ______ ________ ________ go to see your friend now.
下列哪个选项是main( )方法的返回值类型
A．int
B．void
C．boolean
D．Static
