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單項(xiàng)選擇題

Cooling makes the engine metals their mechanical properties（）.

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

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

你可能感興趣的試題

Cooling makes the engine metals their mechanical properties（）.

Gas turbines differ from steam turbines in that （）.