安全消防毎日一問(12.29)
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この投稿は、2017年2月10日07:57にfight3558586によって最終的に編集されました。単択問題1:以下の物質のうち、( )の火災はB類火災に該当します。A、木材 B、アスファルト C、ナトリウム D、ガス
2、防火壁の耐火限界は( )A、3時間; B、3.5時間; C、5時間; D、6時間 参考**:B A
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