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單項(xiàng)選擇題

Cargo pump relief valves are piped to the（）.

A.cargo pump pressure gauges
B.crossover lines interconnecting two pumps
C.suction side of pumps
D.atmosphere through pump vents

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單項(xiàng)選擇題

As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.

A.advance
B.cavitation
C.edging
D.slip

單項(xiàng)選擇題

As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.

A.a not knowing
B.an unknowing
C.an unknown
D.a not known