Derrick discourages Wendy from making one-off solutions because doing so causes efficiency to go down.

井架勸阻溫迪作出一次過的解決方案，因?yàn)檫@樣做的原因效率下降一级AA免费毛片高潮软件。

The drilling crew is responsible to skid the derrick back to the drilling position.

鉆井班移動(dòng)井架到工作位置97超碰资源总站。

When they think that the rocks in a certain place may contain oil, a metal tower called a derrick is built.

當(dāng)認(rèn)為 某處的巖石可能含油時(shí)欧美熟妇另类，就在那里樹立起一個(gè)叫做井架的金屬鉆塔小黄片在线播放情侣。

The stress in tower type of derrick is smaller than the other types of derricks under the combined action of compressive and torsional loads.

與僅受壓載荷相比A片ねんね视频，井架承受壓扭聯(lián)合載荷時(shí)，弦桿應(yīng)力稍有增加26uuu亚洲日韩欧美，而非弦桿應(yīng)力有較大的增加91无码精品xyz。

INTERNALLY DISPLACED \ 流離失所 A worker climbed up a pole to get to a drill as a crew dug a hole for a new clean water well in Chota Lahore relief camp in Swabi, Pakistan, Tuesday.

周二在巴基斯坦斯瓦比的寇塔拉合爾難民營，一名工人爬上鉆井架在线观看黄A片免费网站免费，以尋找新的干凈水源黄色轻点疼视频网站。

Derrick parameter changes at many complicated situations were observed by computer, which was impossible in field or laboratory calculation results showed stress of derrick was smaller when bearing weight at the lower part of the body than that at the upper part, and the maximum stress distributed in positive and back crossbeams of necking site.

通過計(jì)算機(jī)實(shí)顯示現(xiàn)場(chǎng)和實(shí)驗(yàn)室都無法實(shí)現(xiàn)的多種復(fù)雜情況下井架參數(shù)變化過程先锋影音最新av资源网址。

This thesis presents a method of double nonlinear analysis to study the mechanical behavior of derricks steel structures.

本文應(yīng)用雙重非線性有限元方法研究井架結(jié)構(gòu)的力學(xué)行為。

According to the analysis, the nonlinear effects are mainly on the stiffness of downhole derricks steel structure.

本文研究了井架結(jié)構(gòu)的極限承載力問題男女视频在线免费看。

Steel derricks rose to meet our eyes as we drew nearer to the oil fields.

我們快到油田時(shí)看到了矗立的井架。

Length method. Results show that in order to determine the ultimate load capacity of the derricks, both geometrical and material nonlinearities must be considered.

計(jì)算結(jié)果表明欧美刺激a片影院，采用幾何和材料雙重非線性的分析方法能準(zhǔn)確評(píng)估井架的極限承載力无码亚洲电影在线看。