单项选择题

What is NOT a function of the steam drum of a marine water-tube boiler（）.

A.Receives saturated steam from the generating tubes
B.Serves as a reservoir of boiler feed water
C.Holds internal fittings for separation of moisture from steam
D.Collects steam exhausted from the turbines

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To find the cause of a gasoline engine’s failure to start，you should（）.

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B.Disconnect the wires at the spark plugs and make the spark jump the gap
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C.have
D.make