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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

Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.

A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves

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单项选择题

A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.

A.a sewage treatment plant
B.the extended aeration process
C.the liquor
D.the bubbling air

单项选择题

Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.

A.in boiler drums
B.in refrigerating plants
C.in starting air pipes
D.in air coolers

单项选择题

Air reservoirs are designed, built and tested similarly to （）.

A.boiler drums
B.hot wells
C.condensers
D.evaporators

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