Storage batteries should be charged in a well ventilated area because（）.<br>A:they generate heat<br>B:they emit hydrogen<br>C:of the toxic fumes they emit<br>D:they recharge faster in a well ventilated space

Storage batteries should be charged in a well ventilated area because（）.
A:they generate heat
B:they emit hydrogen
C:of the toxic fumes they emit
D:they recharge faster in a well ventilated space

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