high level drilling site; protective seam. ;

numerical simulation study on extraction of protective seam in dawan coal mine

大湾煤矿保护层开采数值模拟研究

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comprehensive gas control in extraction of lower protective seam

开采下保护层的瓦斯综合治理技术

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physical modeling experiment of extraction of protective seam in dip-slopping coal seams

急倾斜煤层开采解放层相似模拟实验

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practice of protective seam extraction of steep, short-interval and complicated seams

急倾斜近距离复杂煤层保护层开采的实践

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the gas comprehensive extracting out technology of underside protective seam

开采下保护层的瓦斯综合抽放技术

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study on drainage of relieved methane from overlying coal seam far away from the protective seam by surface well

地面钻井抽放上覆远距离卸压煤层气试验研究

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experimental study of gas relief from protected seam by gas drainage through crossing holes in upper airway of protective seam

保护层上风巷穿层钻孔抽采被保护层卸压瓦斯的试验研究

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similar simulation study of pressure-relief protection angle during extraction of long-interval lower protective seam

开采远距离下保护层卸压保护角的相似模拟研究

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design of a progressive die for automatic centering of stock guide

导料板自动定心跳步模设计

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the print stock guide path assembly includes left and right guide racks engaged by a common pinion.

导引通道组件包括由一个共同小齿轮所啮合的左和右导引轨。

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d. heave up the stern line

把尾缆绞上来

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the stern set full-time personnel on duty, at any time, observe stern line

船尾设专职人员值班，随时观察尾缆情况，

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tighten the slacked stern line!

拉紧已松弛的尾缆！

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send heaving stern line ashore.

把艉撇缆打到岸上。

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application of unfold logic chart for machine tool

逻辑展开设计法在组合机床上的应用

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main resonance and bifurcation in a nonlinear vehicle suspension system with multi-frequency excitations

多频激励滞后非线性汽车悬架的主共振及其分岔

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theoretical analysis of characteristics on main resonance of a rotating system with nonlinear stiffness

非线性刚度转子系统主共振解析分析

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it is easy that the main resonance of a stepped drive shaft is analyzed with the equivalent shaft.

利用当量轴可方便地分析阶梯传动轴的主共振。

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a bifurcation equation of the steady state main resonance was obtained based on the multiple scales method.

在此基础上，用多尺度法求得稳态下主共振的分岔方程。

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main resonance mechanisms of ferromagnetic nanocrystalline particles in ghz band are natural resonance and exchange resonance.

铁基纳米晶颗粒在吉赫兹频段的主要磁共振机理是自然共振和交换共振。

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