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單項(xiàng)選擇題

UMS stands for（）.

A.ultra much space
B.universal medium system
C.unit machined space
D.unattended machinery space

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單項(xiàng)選擇題

Oil mist detectors are usually used on board to detect oil mist density within （）.

A.the engine crankcase
B.the engine scavenge boxes
C.drain tanks
D.fuel tanks

單項(xiàng)選擇題

A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.

A.regulate the fuel supply
B.maintain a constant fuel viscosity at the fuel valves
C.maintain efficient cooling
D.alter the fuel density