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
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（）.
单项选择题 Severe exposure to chlorine gas can be fatal. Chlorine gas is primarily a（）.
单项选择题 Segregation of cargoes refers to（）.
