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單項選擇題

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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單項選擇題

Since electrical burn victims may be in shock，the FIRST medical response is to check for（）

A.indication of broken bones
B.breathing and heartbeat
C.symptoms of concussion
D.bleeding injuries

單項選擇題

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

A.lighter than air
B.heavier than air
C.a yellow gas that is easily recognized
D.mildly toxic

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