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單項(xiàng)選擇題

Each cylinder in a two stroke cycle engine experiences combustion（）.

A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke

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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

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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