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a section free of objects on only one side只有一面临空的地段
blast gases can propagate through cracks to the horizontal free surface and cause cratering and associated flyrock. This mechanism of flyrock manifestation is closely related to the gas release pulse GRP for airblast爆生气体可经过裂缝传播到水平自由面、并产生漏斗效应及随之而来的飞石。飞石表现的这种机理与冲击波的气体释放脉冲密切有关
coefficient of free swelling自由膨胀率物体遇热或遇水时的体积膨胀量与原来体积之比,以百分数表示
free angle of breakage无挤压爆破漏斗张开角
Safety conscious legislators have long held a vision of an explosives-free mining environment有安全意识的立法人员久久期盼不用炸药的采矿环境
theory of wave interaction with free boundaries and interfaces冲击波与自由边界和自由界面相互作用理论