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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1.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

2.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

3.單項選擇題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

4.單項選擇題An International Oil Pollution Prevention Certificate (IOPP) for a "new" vessel ceases to be valid if （）.

A.it exceeds 3 years from date of issue
B.an alteration approved by the Captain of the Port is made
C.an intermediate survey has not be conducted within 12 months from the date that the IOPP was issued
D.the vessel is transferred to the flag of another country

5.單項選擇題Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?（）

A.Cargo tank ballast
B.Segregated ballast
C.Engine room bilges
D.Cargo pump room bilges