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
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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 -
单项选择题
Segregation of cargoes refers to（）.
A.separating cargoes so that the inherent characteristics of one cannot damage the other
B.separating cargoes by destination
C.classifying cargoes according to their toxicity
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Radiotelegrams requesting medical advice should state briefly and clearly the symptoms of the illness of the person（）.
A.affected
B.effected
C.affecting
D.effecting
