单项选择题
A hydraulic accumulator aboard a ship is designed to（）.
A.store fluid under pressure
B.act as a fluid reservoir
C.provide overpressure relief
D.replenish fluid to a system
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单项选择题
A fuel-air mixture below the lower explosive limit is too（）.
A.rich to burn
B.lean to burn
C.cool to burn
D.dense to burn
