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單項選擇題

In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.

A.an diesel oil heater
B.a waste heat boiler
C.a fresh water generator
D.all the above

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單項選擇題

Impurities from the boiler water surface can be removed through the （）.

A.safety valve
B.blow down valve
C.scum valve
D.feed check valve

單項選擇題

You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.

A.descriptions
B.discrepancies
C.different
D.deflections