Connecting elements of a mooring system should be fabricated from（）.

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

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

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