发现有挂红、挂汗、空气变冷、等突水预兆时,必须停止作业,采取措施,立即报告矿井调度室 发布时间:2019-02-09 00:05 │ 来源:www.tikuol.com 题型:判断题 问题: 发现有挂红、挂汗、空气变冷、等突水预兆时,必须停止作业,采取措施,立即报告矿井调度室,发出警报,撤出所有受水威胁地点的人员。()
题型:判断题 History is ( ) a subject that only lets us know something in history; it also tells us a lot of truth.A.less thanB.more thanC.no more thanD.not more than 查看答案