单项选择题

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

点击查看答案&解析

上一题目录下一题

相关考题

单项选择题

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

单项选择题

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

单项选择题

If fuel tank levels are found to have increased after a grounding, you should suspect （）.

A.a damaged pneumercator line
B.a puncture, crack, or hole in the skin of the vessel
C.improper record keeping of fuel transfer activities
D.contamination of the contaminated steam supply system