drop percussion 中文意思是什麼
drop percussion
解釋
落槌叩診- drop : n 1 滴；液滴，水滴。2 〈pl 〉 【藥學】滴劑；滴眼藥。3 微量，點滴；一口[杯]酒。4 滴狀物；耳墜；水...
- percussion : n. 1. 敲打，叩擊；撞擊；碰撞。2. （由敲打產生的）震動。3. 【音樂】打擊；（樂隊的）打擊樂器組。4. 【軍事】擊發（裝置）。5. 【醫學】扣診（法）。
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Abstract : the paper presented a kind of drilling hole method that adopted direct circulation and percussion drilling, casing and cliff - protection by mud. the method applied in the complex gravel layer which has the trend to emerge cave - in and drop from the drilling wall
文摘:介紹一種在砂卵石地層層厚復雜、孔壁易掉塊、易坍塌的鉆孔的成孔方法? ?正循環回轉與沖擊鉆進、套管與泥漿護壁成孔。
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