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单选题

Open safety and tag these circuit breakers.

A断开这些跳开关,装上安全夹,并挂上标牌。

B打开这些跳开关,打保险,然后填写标牌。

C打开这些跳开关,确保其安全性并挂上标牌。

正确答案:A (备注:此答案有误)

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