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
Before welding in a tank that has carried petroleum pro...
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
Before welding can be done in a tank that has carried p...
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
At the same time，it is（）for you to signify your acknowl...
单项选择题At the same time，it is（）for you to signify your acknowledgement of the responsibility for the collision by signing the copies of this letter hereto attached and to return me two copies in due time.
A.essential B.important C.good D.a better operation
