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

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A fire starting by spontaneous combustion can be expected in which condition?（）

A.Paints，varnish，or other liquid flammables are stowed in a dry stores locker
B.Inert cargoes such as pig iron are loaded in a wet condition
C.Oily rags are stowed in a metal pail
D.Clean mattresses are stored in contact with an electric light bulb

单项选择题

A double male coupling is one that（）.

A.has left hand twist
B.has inside threads on both ends
C.has outside threads on both ends
D.takes two men to operate