單項(xiàng)選擇題Switchboards may be of the dead-front type in which all live parts are installed behind （） and only the operation handles and instruments are on the front.

A.the capstan
B.the collector
C.the panels
D.the surface


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1.單項(xiàng)選擇題The emergency generator or emergency battery is connected to（） on most large ships.

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

2.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

3.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

4.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

5.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