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單項選擇題

An oil water monitor is required in order to measure （）.

A.the oil content in water
B.the water content in fuel oil
C.the water level in bilge well
D.the oil level in bilge well

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The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.

A.whenever
B.however
C.wherever
D.whether

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Gear pumps are （） because they discharge a near constant amount of liquid regardless of pressure.

A.negative displacement type
B.turbine type
C.positive displacement type
D.mixed-flow type