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- teclmology of Roof Coal Caving 放顶煤技术
- An artificial neural network for distinguishing the difficulty degree of roof coal caving of steep seam 急倾斜煤层顶煤可放性识别的神经网络模型
- This technique has been used successfully in the air-return gate oJ" 1310 fully mechanized roof coal caving face in Zhangcun Coal Mine. 该项研究在漳村1310综放面回风巷的工程实践中得到了成功应用和检验。
- Mechanical model for the elastic thick outrigger of roof coal is set up. 建立了顶煤弹性深梁力学模型,分析了顶煤应力分布及顶煤破坏形式。
- blasting mining with caving of roof coal 炮采放顶煤
- fully mechanized coal face with caving of roof coal 综放工作面
- fully mechanized mining with caving of roof coal 放顶煤开采
- fully mechanized face with caving of roof coal 综放工作面
- Study on Preventing Roof Coal Caving in Big Section Bottom Driving 大断面沿底巷道掘进防顶煤冒落研究
- fully mechanized coal mining with caving of roof coal 综采放顶煤
- fully mechanized technology with caving of roof coal 综放工艺
- The Technology Study of Roof Coal Presplitting in Thick Seam Caving Coal Mining 厚煤层放顶煤开采顶煤预裂技术研究
- The varying angles of roof slope. 屋顶斜面多种多样的角。
- "There are four acres of roof," Charlotte told him. “屋顶的面积有四公顷,”夏洛蒂告诉他。
- Use: windows of roof and balcony. 用途:屋顶窗,阳台窗。
- Laws and Features of the Surface Subsidence Occurred during the Fully-mechanized Coal Mining with Caving of Roof Coal in the High Loose Seam 厚松散层综放开采地表沉陷规律及特点
- Opening a new window just must dismantle on the part of roof. 开一个新窗户就得拆除部分房顶。
- Roof coal caving mining 放顶煤回采
- From his attic window he looked out over a wilderness of roofs. 从他阁楼的窗子望出去,他看到一大片屋顶。
- roof coal caving 放项煤开采