在镗削垂直孔时，如用回转工作台找正，工件只要安装（）次，既能完成垂直孔系的加工。
A.3
B.2
C.1
参考答案：C
( )1. He and his friends had a fun playing basketball.
A B C D
( )2. Tom borrowed these new shoes to Jim last night.
( )3. He didn't went to school last week.
( )4. Jack went to see his teacher and asks some questions.
( )5. He drove his new car and stoped in the street yesterday.
_____
下列关于酒店工程部人员的配置，说法正确的是（）。
A、夜班应配备至少一名电工和一名水工或机械工
B、白班则所有七个工种都应配备齐全
C、如遇工作量不多的日子，也不应减少人数或工种
D、每个工种的人数由具体工作量来决定
