单项选择题
When fighting a fire in an enclosed space，the hose team should crouch as low as possible to（）.
A.protect themselves from smoke B.obtain the best available air C.allow the heat and steam to pass overhead D.All of the above
单项选择题 When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.
单项选择题 When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.
单项选择题 A shipboard Oil Pollution Emergency Plan is required of（）.
