單項(xiàng)選擇題

Electrical circuits are protected against overheating by means of a/an （）.

A.circuit breaker
B.amplifier
C.diode
D.capacitor

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單項(xiàng)選擇題
Routine maintenance of lead acid batteries should include （）.
A.keeping the terminals clean
B.coating cable connections with petroleum jelly
C.maintaining a trickle charge
D.All of the above
單項(xiàng)選擇題
Under which of the listed conditions can the engine room retake the throttle control from the bridge（）.
A.Any time it is deemed necessary
B.Only with the masters permission
C.After a 10 minute delay to the input command
D.Only after the throttle has been placed in stop

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