离心式压缩机和其他形式的压缩机相比,最特殊的部位是()。
A.轴封器
B.增速器
C.蒸发器
D.冷凝器
参考答案:B
将50364四舍五入并保留两个有效数字是( )。
— Rose, we will start at six tomorrow morning. Don't be late, _______ ?
— _______ . I'll be there on time.
A. won't you; Yes, I will B. will you; Yes, I will C. will you; No, I won't