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- wave protects coal post 水体保护煤柱
- lower upper coal post with loyers 上分层煤柱下
- The travelling wave propagation under different type of faults in transmission line is analyzed, its results are useful for travelling wave protection and fault location. 对输电线不同短路故障类型情况下的行波传播特点进行了分析研究。研究结果对利用行波特点来进行行波保护和故障测距都是非常有用的。
- More, we built a traveling wave protecting model for HVDC transmission lines based on the GZB-SNQ HVDC project which could be run on the simulation software“PSCAD/ EMTDC”. 然后在天广直流输电系统的基础上,建立了基于仿真软件PSCAD/EMTDC的高压直流输电线路行波保护的数学模型。
- Wave protection effects of circular arc wave walls and paraboilc wave walls are compared and analyzed,showing that curving wave walls are very effective in preventing overtopping. 文章中就圆弧型及抛物型曲面挡浪墙的防浪效果进行了对比,说明曲线防浪墙对阻止越浪是十分有效的。
- It has outlined the law of geometry formula computation as well as the formula derivation of the coal amount among the range of protecting coal column,has pointed out the superiority of this law comparing with the traditional method. 概述了保护煤柱留设的几何公式计算法以及保护煤柱压煤量公式的推导,与传统方法作了类比,指出此法的优越性。
- Mining on conditions that ponding at the same layer of Yongquan mine area,the method and relative technical parameters of leaving the safety protective coal rock pillar are introduced. 介绍了阳泉矿区在有同层积水威胁情况下开采,留设安全保护煤岩柱的方法和有关技术参数。
- Wave screens are often constructed on the top of sloping wave protection constructions such as seawall, revetments, etc. to meet the requirements of overtopping and stability and cut down engineering cost. 摘要在海堤、护岸等斜坡式防浪建筑物中,为满足越浪与稳定要求,减少工程投资,通常在堤顶设置防浪墙。
- Bill wave his hand to us and then drive away. 比尔向我们挥手告别后开车走了。
- Radio2 can be heard on the long wave band. 第二广播电台可在长波段收听到。
- I am able to pick you up on the short wave radio. 我能用短波收音机收听到你的信号。
- A wave broke across the surface of the pool. 一个波浪从池水表面掠过。
- The insurance policy protects you against injury. 如遭伤害,这保险单保证偿付你的损失。
- I was able to pick you up on the short wave radio. 我能用短波收音机收听到你的信号。
- Our clothing protects us from the cold. 衣服帮我们御寒。
- The tidal wave formed a terrifying wall of water. 海啸形成一堵骇人的水墙。
- The cream protects your skin from sunburn. 这种乳霜保护你的皮肤不致被太阳晒伤。
- See if you can wave down a taxi. 你挥手,看看能否让出租车停下。
- The boat was swamped with a huge wave. 一个巨浪淹没了那条船。
- On the smooth wave in trembling beauty sleep. 在微浪的美妙颤抖中缓缓合目。