单项选择题

Once all cylinders are firing regularly, （） is shut off.

A.the exhaust valve
B.the starting air
C.the inlet valve
D.the fuel oil

点击查看答案&解析

上一题目录下一题

单项选择题

A.to protect
B.to guard
C.to maximize
D.to minimize

单项选择题

A.will be speeded up
B.should be slowed down
C.must slow down
D.have to be slow down

单项选择题

A.the trunking should be opened up
B.should the trunking be opened up
C.the trunking should not be opened up
D.should the trunking not be opened up