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單項(xiàng)選擇題

Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.

A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above

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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

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