percent by sand 望壅垦
The work in the city is only 30 percent done, and 70 percent is still under the sand.
这个城市对旅游的工作仅做了30%,剩下70%的旅游资源仍然被埋在沙子里没有开发出来。
Answer: want first choice, remaking sand, through the magnetic separation, flotation or chemical purification, silica be 95 percent.
答:先要精选,再制砂后,经磁选、浮选或化学提纯后,二氧化硅能达到95%。
Applying the stimulation with fracturing for sand shale in Daqing volcanic gas reservoir, the success rate of operation is only 36 percent. The result of the stimulation is bad.
火山岩气藏应用砂泥岩压裂技术进行增产改造,施工成功率只有36%,增产效果差。
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