题目：
爆破前，必须在进入爆破地点的所有通路上放警戒，放警戒时，要（）。
A.警戒点必须安全
B.警戒处要有栏杆或拉绳
C.警戒处要设置警戒牌
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
爆破前，必须在进入爆破地点的所有通路上放警戒，放警戒时，要（）。 A.警戒点必须安全
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