问题
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
答案
参考答案：B
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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
参考答案：B