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- In the light of the frequent breaking of the rod string in a surface driven screw pump well, the force condition of the string in the well is analyzed by means of the elastoplasticity theory. 針對井口驅動(dòng)螺桿泵抽油桿柱斷脫頻繁的問(wèn)題，應用彈塑性理論分析了抽油桿柱在井中的受力狀況。
- Partial abrasion of rod string in screw pump well which is surface driven is the main reason that restricts its application, but the prevention method used presently cant solve the problem radically. 地面驅動(dòng)螺桿泵井抽油桿的偏磨是制約螺桿泵應用的主要原因,目前采用的防治方法不能從根本上解決該問(wèn)題。
- The slider of USM is consisted of two same vibrators in the prototype, in which has double-contact surfaces drive, so high driving power can be obtained. 樣機利用兩個(gè)相同振子組成一個(gè)動(dòng)子，構成雙接觸面驅動(dòng)，從而獲得較大的驅動(dòng)力。
- The gas bubbled to the surface of the water. 氣體變成氣泡升上水面。
- The surface of the liquid gradually crusted over. 液體表面漸漸地結了一層皮。
- A breeze ruffled the surface of the lake. 一陣微風(fēng)吹皺了湖面。
- A wave broke across the surface of the pool. 一個(gè)波浪從池水表面掠過(guò)。
- The calm water surface is very much like a mirror. 那平靜的水面十分象一面鏡子。
- Acid had pitted the surface of the silver. 酸把銀器的表面腐蝕了。
- He is honest only on the surface. 他只是表面誠實(shí)而已。
- A film of mucus and bacteria on a tooth surface. 齒菌斑牙齒表面一層粘液和細菌的膜
- The hard outer portion or surface area of bread. 面包皮面包的表面區域的硬皮
- Surface mail takes longer than airmail. 普通郵件比航空郵件慢。
- The surface of the lake is quite still. 湖面相當平靜。
- It's2 yuan by surface mail and3.6 yuan by air. 寄平信2元，寄航空要3元6角。
- Wheels won't bite on a slippery surface. 車(chē)輪打滑。
- The surface must be thoroughly clean. 表面必須徹底弄清潔。
- The surface between the ribs of a ribbed vault. 梁腹，腹板某扇形拱的脅拱之間的平面
- An indented or concave surface or area. 凹陷，洼地凹的表面或地區
- The submarine rose to the surface. 潛艇露出了水面。
