单项选择题
A fishing vessel that is required to have a fireman’s outfit，must have all of the following in the outfit except a（）.
A.flashlight B.combustible gas indicator C.self-contained breathing apparatus D.fire axe
单项选择题 A fire starting by spontaneous combustion can be expected in which condition?（）
单项选择题 A double male coupling is one that（）.
单项选择题 What is LEAST likely to cause ignition of fuel vapors?（）.
