Recent developments in automatic reading of liquid column height have evolved. 最近已研制成功各種自動(dòng)讀出液柱高度的新裝置。
The correct volume ensures that the column of fluid in the tubing string is balanced by the column of fluid in the annulus. 正確的用量確保了在油管柱中的液柱被環(huán)形空間中的液柱所平衡。
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