單項(xiàng)選擇題The main generators are connected to().

A.distribution boards
B.section boards
C.emergency switch boards
D.main switch boards


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1.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

2.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

3.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

4.單項(xiàng)選擇題A manometer is used to measure ().

A.pressure
B.temperature
C.volume
D.specific gravity

5.單項(xiàng)選擇題"gauge pressure" means().

A."vacuum"
B."the excess of pressure above atmosphere"
C."figure on a gauge"
D.Any of the above