单项选择题
UMS stands for（）.
A.ultra much space
B.universal medium system
C.unit machined space
D.unattended machinery space
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相关考题
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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 -
单项选择题
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 -
单项选择题
A manometer is used to measure （）.
A.pressure
B.temperature
C.volume
D.specific gravity
