单项选择题

A supercharged engine differs from an un-supercharged engine it operates at an increases pressure（）.

A.in which
B.on which
C.at which
D.in that

点击查看答案&解析

上一题目录下一题

相关考题

单项选择题

Cooling makes the engine metals their mechanical properties（）.

A.Remain
B.to remain
C.retain
D.to retain

单项选择题

Gas turbines differ from steam turbines in that （）.

A.steam rather than gas is used to turn a shaft
B.vapor rather than gas is used to turn a shaft
C.the former uses gas to turn a shaft
D.the latter uses gas to turn a shaft

单项选择题

The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.

A.they operate between 150 and 450 rpm
B.they are connected to the propeller by gearing
C.their smaller size and weight
D.they can be connected directly to the propeller without gearing