單項(xiàng)選擇題

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

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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

單項(xiàng)選擇題

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

Chafing gear（）.

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

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

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