單項選擇題

All removals to be reassembled in order（）of repairs.

A.upon commencement
B.on completion
C.before ending
D.after beginning

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單項選擇題

After riveting is completed，the joints on the shell of a vessel are generally made watertight by（）.

A.faying
B.caulking
C.felt or canvas packing
D.red lead

單項選擇題

A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.

A.master bushing
B.kelly slips
C.kelly bushing
D.rotary bushing