单项选择题
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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单项选择题
Since accumulations of H2S gas on a ship can be dangerous to personnel，it is important to know that H2S gas is（）.
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