单项选择题

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

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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（）.

A.lighter than air
B.heavier than air
C.a yellow gas that is easily recognized
D.mildly toxic
单项选择题
Severe exposure to chlorine gas can be fatal. Chlorine gas is primarily a（）.

A.respiratory irritant
B.skin burning agent
C.blood poisoning agent
D.nerve paralyzing irritant
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