单项选择题
Connecting elements of a mooring system should be fabricated from（）.
A.cast iron
B.forged steel
C.stainless steel
D.cast steel
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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 -
单项选择题
Chafing gear（）.
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
