單項選擇題A hydraulic machine is one that uses () to do work.

A.liquid
B.steam
C.gas
D.electricity


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1.單項選擇題If oil density were greater than water’s, the oil separator ().

A.did work
B.would work well
C.didnt work
D.wouldnt work

3.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

5.單項選擇題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