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

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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
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