单项选择题
A.without losing the rhythm of respiration B.only with the help of two other people C.by not stopping the respiration for more than 5 minutes D.at ten minute intervals
Carbon dioxide as a fire fighting agent has which advan...
单项选择题Carbon dioxide as a fire fighting agent has which advantage over other agents?（）
A.It causes minimal damage B.It is safer for personnel C.It is cheaper D.It is most effective on a per unit basis
Camphor oil is classified as a（）.A.Grade A flammable li...
单项选择题Camphor oil is classified as a（）.
A.Grade A flammable liquid B.Grade C flammable liquid C.Grade D combustible liquid D.Grade E combustible liquid
By regulation，you MUST keep a record of the use of your...
单项选择题By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.
A.six months B.one year C.two years D.thirty months
