某防水工程,施工环境气温-8℃,应选择的防水材料是( )。
根据《矿山安全法》,矿山建设工程安全设施竣工后,由( )验收,并须有( )参加;不符合矿山安全规程和行业技术规范的,不得验收,不得投入生产。
_______stage for teaching writing includes discussion or debate on relevant topic, picture telling, free talk, reading short passages, and audio-visual activities.