单项选择题
A.smoky exhaust B.starting failure C.overload D.over speed
A supercharged engine differs from an un-supercharged e...
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
Cooling makes the engine metals their mechanical proper...
单项选择题Cooling makes the engine metals their mechanical properties（）.
A.Remain B.to remain C.retain D.to retain
Gas turbines differ from steam turbines in that （）.A.st...
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
