单项选择题
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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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 -
单项选择题
Cargo pump relief valves are piped to the（）.
A.cargo pump pressure gauges
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单项选择题
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
