问题
单项选择题
A safety shackle is identified by its（）.
A.shape
B.pin
C.certification stamp
D.color code
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
A safety shackle is identified by its（）.
A.shape
B.pin
C.certification stamp
D.color code
参考答案：B
