【单选题】One of the main functions of wearing rings, as used in a centrifugal pump, is to _____.
A.
maintain radial alignment between the pump impeller and casing
B.
absorb all impeller shaft end thrust
C.
prevent water leakage to the atmosphere
D.
prevent wear of the pump casing and/or impeller
【单选题】在C语言中,以下叙述不正确的是:
A.
在C程序中,无论是整数还是实数,都能被准确无误的表示
【单选题】以下正确的叙述是( )
B.
若a是实型变量,C程序中允许赋值a=10,因此实型变量中允许存放整型数
C.
在C程序中,无论整数还是实数,都能被准确无误的表示
【单选题】I won't go there _____ this term _____. [ ]
【单选题】松赞干布为迎娶文成公主而建的宫保式建筑群是()
【多选题】下列关于C语言用户标识符的叙述中,不正确的叙述是:()
B.
用户标识符中不可以出现中划线,但可以出现下划线
C.
用户标识符中可以出现下划线,但不可以放在用户标识符的开头
D.
用户标识符中可以出现下划线和数字,它们都可以放在用户标识符的开头
【单选题】This term _ __ over. The summer vacation is coming in two weeks.
【简答题】根据对话内容, 从对话后的选项中选出能填入空白处的最佳选项。 —I’m so happy that this term is over. We can enjoy the summer holidays. —Me too. We can relax ourselves at last. — 61 —Yes, I’ll go back to my hometown. It has been a ...
【单选题】On a ship,a fire pump may be used for other purposes if().
A.
the other services are run off a reducing station with a pressure gage
B.
a separate fire pump is available for use on the fire main
C.
all other services are operated by a manifold near the pump