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

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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

单项选择题

At least one reinspection shall be made on each vessel holding a Certificate of Inspection valid for two years. This inspection shall be held between the tenth and fourteenth months of the duration period of the certificate and shall be（）.

A.at the discretion of the inspector，but in no greater detail than required for original certification
B.at the discretion of the inspector，but in no lesser detail than required for original certification
C.generally similar in scope to the inspection required for certification，but in less detail
D.equivalent to the inspection required for certification

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At（）an occasional survey has been carried out．

A.the remind of the master
B.the refer of the master
C.the render of the master
D.the request of the master