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單項選擇題

The explosive range of a mixture of flammable vapors is specified as a percentage of （）.

A.flammable vapor by volume in air
B.oxygen present to support combustion
C.the temperature of the flash point
D.the lower limit of explosibility of the mixture

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單項選擇題

What safety precautions should be observed by the crew while working around machinery in an engine room?（）

A.They should wear safety shoes
B.They should wear ear protection
C.They should not wear jewelry
D.All of the above

單項選擇題

The word "discharge" as used in Pollution Prevention Regulations applies to oil （）.

A.leaked into navigable waters
B.poured into navigable waters
C.pumped into navigable waters through a fixed piping system
D.all of the above