单选题Storage batteries should be charged in a well ventilated area because（）.Athey generate heatBthey emit hydrogenCof the toxic fumes they emitDthey recharge faster in a well ventilated space
单选题
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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