题目内容 (请给出正确答案)
[主观题]

When you hear three short blasts on the ships whistle and the same signal on the general alarm bells, you _____.

A.are required to go to your life-raft

B.are dismissed from drills

C.should point to the man overboard

D.should start the fire pump

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第1题

To obtain maximum efficiency, two stage air compressors are usually _____.

A.horizontally mounted

B.never fitted with intake filters

C.fitted with intercoolers

D.operated in an unloaded condition at all times

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第2题

When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of .

A.insufficient lubrication

B.improper piston cooling

C.blow-by

D.overload operation

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第3题

If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be _____.

A.a shortage of compressor oil

B.warm food in the refrigerator

C.excessive condenser cooling water

D.a shortage of refrigerant

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第4题

All bilge suction must be fitted with suitable _____, which in the machinery space would be mud boxes positioned at floor-plate level for easy access.

A.strainers

B.valves

C.elements

D.separators

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