问题
单项选择题
Safety shackles are fitted with（）.
A.a threaded bolt
B.a round pin，with a cotter pin
C.a threaded bolt，locknuts，and cotter pins
D.round pins and locknuts
答案
参考答案：C
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Safety shackles are fitted with（）.
A.a threaded bolt
B.a round pin，with a cotter pin
C.a threaded bolt，locknuts，and cotter pins
D.round pins and locknuts
参考答案：C