單項(xiàng)選擇題

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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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

單項(xiàng)選擇題

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

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

你可能感興趣的試題

Chafing gear（）.

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

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

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