单项选择题

Chain slings are suitable for heavy slender articles，such as（）.

A.timber or steel rails
B.locomotives or boilers
C.railway passenger coaches
D.motor vehicles

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单项选择题

A.reduces and prevents corrosion of standing rigging
B.prevents corrosion of running rigging
C.reduces and prevents wear caused by the rubbing of one object against another
D.protects the body against extreme cold

单项选择题

Before welding in a tank that has carried petroleum products，the tank must be certified by （）.

A.the Coast Guard
B.the ABS
C.the shipyard fire department
D.a certified marine chemist

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