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單項選擇題

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

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單項選擇題

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

單項選擇題

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

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