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單項選擇題

Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive（） the life of the ship.

A.along
B.will
C.throughout
D.for

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單項選擇題

The current flowing first in one direction and then in another is called（） current.

A.an alternating
B.a rush
C.a direct
D.an exciting

單項選擇題

Shore power must be（） during dock repair.

A.disconnected
B.switched off
C.cut off
D.connected

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