单项选择题

Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）.

A.the Customs
B.the Register Bureau of Shipping
C.the Shipyard Fire Department
D.a certified gas chemist

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单项选择题
（）is not a process of weathering of the oil spilled in the sea water.

A.Biodegradation
B.Dissolution
C.Cleaning up by crew with skimmers
D.Oxidation including photooxidation
单项选择题
A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.

A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid
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