crushed-gravel
... crushed concrete 粉碎的混凝土 crushed graudio-videoel 碎砾石 crushed stone roots course 碎石块底盘 ...
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碎砾石
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压碎砾石 crushed gravel
砾石破碎机 conglomerate mill
砾碎石沙漠 pebble cobble desert
碎石角砾岩 rubble breccia
石灰碎砾岩 lime rubble rock
砾石破碎流程 SAGC
砾石破碎 gravel shattering
·2,447,543篇论文数据，部分数据来源于NoteExpress
针对沙漠及碎砾石覆盖下的岩石区域，目前尚无有效的钻井手段。不过，根据不同的地质条件使用不同的钻具，也能取得较好的效果。
There are no effective means currently in rocky areas covered by desert and broken gravels, but it can still obtain a good result if using different drilling tools in different geologic conditions.
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