After the modification of step feed mechanism of deep drill combined machine tool, simplifying structure, convenient adjustment and reducing fault rate have been proved.
对深孔钻屑组合机床分级进给机构进行改进后，达到了简化结构、方便调整、减少故障的目的。
Combined with engineering example the characteristics of auger drill and construction defects for special strata are discussed.
结合工程实例，论证了旋挖钻机的特点及在特殊地层的施工缺陷。
Combined with theory, we thought of the respond work principle to emergency, pre - arranged planning, drill and related policy.
文章结合理论，对企业在突发事件中应对媒体的工作原则和应对突发事件的预案、演练及相关策略进行思考。
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