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

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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
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