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轻于水的和不溶于水的易燃液体,原则上不可用水扑救。
分析事件一中施工单位提出增设进口横洞的理由。
简述萤火虫的生活习性。
由断层的封闭作用而形成的油气藏可分为几类?
目前世界上通行的税权划分模式有()。
消费者购买商品后的满意程度,取决于()
预防钩端螺旋体病的有效的特异措施是( )。
员工培训制度
组合列车
冷凝是指()物质经过冷却使其转变为()。在制冷技术中,指制冷剂在冷凝器中由()凝结为()的过程。
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