冲

Based on the practice of the use of φ95mm subsurface sucker rod pump in Shengtuo Oilfield in recent years, the causes of the failure of the pump are analyzed, and relevant precautions are put forward:(1)selecting oil wells with sufficient fluid supply for pumping;(2)under the condition of the pump efficiency being the same, the submergence depth of the pump being somewhat larger than that of the small pump, and 450～500m being feasible;(3)adopting Grade H ultrahigh-strength rod string and fixing a sinker bar at the bottom of the rod string;(4)selecting long stroke and low pumping speed, and more than 5m stroke and less than 6min-1 pumping speed being recommended;(5)adopting zirconium oxide valve ball and seat ＋ spray welded plunger ＋ nitrided barrel.

根据胜坨油田近几年采用φ95mm有杆抽油泵提液的实践，分析了造成这种抽油泵失效的原因，包括与其配套的脱节器失效、抽油杆断脱、泵漏、电动机不配套和生产管理不善等。为增强泵的提液能力和工作可靠性，提出5 项预防措施：(1)选择有充足供液能力的油井；(2)在保持相同泵效的情况下，泵的沉没度应略大于小泵，推荐按450～500m设计；(3)采用H级超高强度抽油杆柱，并在杆柱底部配置一定重量的加重杆；(4)采用长冲程、低冲次的参数匹配，推荐光杆冲程大于5m，冲次小于6min-1；(5)为提高泵筒、活塞和阀座的防腐耐磨性，推荐采用&氧化锆阀球和阀座+喷焊柱塞+氮化泵筒&的结构形式。

After breakfast they went whooping and prancing out on the bar, and chased each other round and round, shedding clothes as they went, until they were naked, and then continued the frolic far away up the shoal water of the bar, against the stiff current, which latter tripped their legs from under them from time to time and greatly increased the fun.

早饭后，他们欢呼雀跃地向沙洲奔去。他们相互追逐，转着圈圈跑，边跑边脱掉身上的衣服，等全身脱个精光后，继续嬉闹，一直跑到沙洲的浅水滩上，逆着水流站着，水流从他们腿上冲过，时常要把他们冲倒，这种冒险给他们带来了极大的乐趣。

Seeing this I cried out and made a terrible racket,rushed over to the crab's side,furiously kicked sand on to his shell,and so confused the gull that he flew off in search of an easier meal.

我把这一切都看在了眼里。我大声叫着，使劲扑打着翅膀，冲到了小螃蟹身边，发疯似地把沙子踢在了它的身上。当海鸥冲下来的时候，却发现它的目标一下子不见了。

The polyurea coating was tested with Taber tribomachine and the highp ressure water jet erosion tester for studying the wear behavior of polyure coating under conditions of dry friction and highspeed water jet contained sand. The morphology of the coating was observed with SEM and Chromatic confocal 3D Profiler. The surface component of test samp les was measured by FT2IR Spectrometer and Electron Energy Disperse Spectroscopy. The p roperties of polyurea coating under two testing conditionswas analyzed.

为研究聚脲涂层在干摩擦条件下和高速含砂水流冲蚀条件下的性能变化情况，用 Taber 磨损试验机和高速含沙水射冲蚀磨损试验机测试了聚脲涂层的磨损性能，用扫描电子显微镜和白光共焦三维轮廓仪观测涂层的磨损表面形貌，用表面红外光谱和电子显微镜能谱元素分析了涂层表面试验前后的组分变化，分析了涂层在2种摩擦条件下的磨损情况。

House's air impact moulding is a way to impact the sand with general impact flask in an enclosed impact house.

仓式气冲造型是指在密闭的冲击仓里用普通砂箱进行冲击紧实的一种方法，其关键是砂箱周围冲击仓的间隙体积本文研究了间隙率对仓式气冲造型紧实效果的影

The results show that the erosion volume grows with the increment of pump pressure, there are best rock-breaking jet length, abrasive concentration and particle size. In low concentration, the erosion energy of post-mixed pulsed abrasive jet is close to the pre-mixed pulsed abrasive jet. After the external fluid is drawn in, the jet dynamic pressure increases by 7%, while pulse amplitude increases by 150%.

结果表明：冲蚀体积随泵压增大而增加，存在破岩的最佳喷距、磨料浓度和磨料粒径；在较低浓度下，后混合磨料脉冲射流的冲蚀性能较接近于前混合磨料脉冲射流；引入外部流体后射流的动压力增大了7%，脉冲幅值提高了1.5倍。

When it saw the rock being tossed about pitifully, it said,"Only a weak person will make a detour . A personwho is strong will only go ahead, and nothing will stop him!"

看到岩石被可怜的冲来冲去，河说：&只有弱者才会绕道，强者只会勇往直前，任何东西都无法阻挡它！&

When it saw the rock being tossed about pitifully, it said,"Only a weak person will make a detour. A person who is strong will only go ahead, and nothing will stop him!"

看到岩石被可怜的冲来冲去，河说：&只有弱者才会绕道，强者只会勇往直前，任何东西都无法阻挡它！&

The results indicated that the erosive wear resistance of the coupling sample with pitting structure is 18.7% higher than that of the sample without pits under the following test conditions: erosive time duration 180 s,sand impact angle 30°, impact distance 200 mm, blast air pressure 0.4 MPa.

结果表明，在冲蚀时间为180 s，入射角为30°，入射距离为200 mm，空气压力为0.4 MPa条件下，耦合试样耐冲蚀磨损性能较对照试样提高18.7%。

Big cock red wings wife abuse placed next, look at the south wing of a dove a little gray, did not say anything, but with a sigh , red flowers are still visible in the window of an old mother hen, said: Oh, you were down bar!

大公鸡冲老伴儿摆了下翅膀，瞧了一眼南楼的小灰鸽一眼，没有说什么，只是叹了一口气，冲仍趴在窗台上的老花母鸡说：哎呀，你快下来吧！

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。