单项选择题
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（）.
单项选择题 Radiotelegrams requesting medical advice should state briefly and clearly the symptoms of the illness of the person（）.
单项选择题 Persons who have swallowed a non-petroleum based poison are given large quantities of warm soapy water or warm salt water to（）.