单项选择题
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
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A.master bushing
B.kelly slips
C.kelly bushing
D.rotary bushing -
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A self-contained breathing apparatus is used to（）.
A.make underwater repairs to barges
B.determine if the air in a tank is safe for men
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A.make the trip only after obtaining a Permit to Proceed to Another Port for Repair，Form CG-948
B.get underway as soon as possible
C.hire a tug and pilot instead
D.request an Expiration Certificate if the vessel displays a tendency to sink
