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煤礦必須編制火災事故應急預案,每年至少組織( ?)次應急預案演練。

2021-11-19 10:20 所屬題庫:煤礦 火災 事故 預案 每年
題目信息:

  煤礦必須編制火災事故應急預案,每年至少組織( )次應急預案演練。

  A.1 B.2 C.3

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