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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

The air reservoirs must have （） fitted to prevent rupture in the event of fire.

A.high pressure alarm
B.fire alarm
C.extinguishers
D.fusible plugs

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单项选择题
Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.

A.filled
B.evacuated
C.compressed
D.charged
单项选择题
Generally speaking, suction heads require to be （） for high speed or large capacities than for low speed or small capacities.

A.greater
B.smaller
C.better
D.worse
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Some of the energy fed into the pump will be dissipated as （） due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity.

A.hydraulic head
B.static head
C.heat energy
D.steam
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