单项选择题

The function of a rectifier is similar to that of a （）.

A.trap
B.regulating valve
C.check valve
D.filter

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单项选择题

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

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

单项选择题

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

单项选择题

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