客家三宝是（）。
A.擂茶
B.珍珠粉
C.客家酿酒
D.客家山歌
参考答案：A, B, D
He likes to play basketball very much. He wants to make by basketball in the future.
A. living; playing B. a living; playing C. a living; play
不平衡的旋转零、部件运转时（）。
A、使用寿命长
B、不影响工作精度
C、产生剧烈振动
D、振动噪音小
