Routine maintenance of lead acid batteries should include （）.<br>A:keeping the terminals clean<br>B:coating cable connections with petroleum jelly<br>C:maintaining a trickle charge<br>D:All of the above

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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