單項(xiàng)選擇題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
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1.單項(xiàng)選擇題Cooling makes the engine metals their mechanical properties（）.
A.Remain
B.to remain
C.retain
D.to retain
2.單項(xiàng)選擇題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
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