问题
单项选择题
When riveted joints occur at the ends of plating they are called（）.
A.trailers
B.terminals
C.seams
D.butts
答案
参考答案：D
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When riveted joints occur at the ends of plating they are called（）.
A.trailers
B.terminals
C.seams
D.butts
参考答案：D