题目内容
（请给出正确答案）
[多选题]
If there are no protection switching events in our PTN device currently, which of the
A.protection path signal failure
B.working path signal failure
C.forced switching
D.protection locking
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
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