Triangle cut was adopted and directional window was excavated by cutting blasting and pneumatic pick repair.
方案设计采用三角形爆破缺口，掏槽爆破加风镐修整开凿定向窗。
The dynamic process of pneumatic pick and the conditions under which the normal starting and stable working are available are discussed by way of the theory of point transformation.
用点变换理论分析气镐的动力过程，讨论气镐正常起动和稳定工作的条件。
Coleman EzLift is a pneumatic lifting device used to pick up and balance varying loads.
科尔曼气动升降机是一种用于提起和平衡变化的负荷的气动升降设备。
Coleman EzLift is a pneumatic lifting device used to pick up and balance varying loads.
科尔曼气动升降机是一种用于提起和平衡变化的负荷的气动升降设备。
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