This safety assessment is instructive for solving the problems in the well during drilling, and it is the key point for this assessment to acquire the dynamic amplificatory coefficient of derricks.

動(dòng)態(tài)應(yīng)力應(yīng)變法作為井架承載能力安全評價(jià)的一種科學(xué)亚洲男人第一Av网站国产、合理免费视频性综合、全面的方法，動(dòng)力放大系數(shù)的獲得是該方法的關(guān)鍵之處黄色V在线观看。

You have derricks at all the hatches, don't you?

你們所有艙口都有吊桿是嗎久久一及黄色视频？

This method can be used for an overall and precise analysis of the structure of the derrick, and a case study shows that this method is suitable for all kinds of derricks.

實(shí)例測試和計(jì)算機(jī)載荷模擬試驗(yàn)表明欧美熟女俱乐部，這種方法可使井架的試驗(yàn)和分析更加全面男女性爽大片免费看在线搜索、準(zhǔn)確、可靠超91自拍偷拍，而且適用于各種類型的井架免费作爱视频在线观看网站。

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91精品午夜在线看桃花岛。

derricks：吊桿

derricking winch 吊桿絞車 | derricks 吊桿 | derricks 吊桿式起貨設(shè)備

derricks：吊桿式起貨設(shè)備

derricks 吊桿 | derricks 吊桿式起貨設(shè)備 | derusting 除銹

derricks：起重機(jī)

070095 起重機(jī) Hoists | 070251 起重機(jī) Derricks | 070251 起重機(jī) Derricks

derricks：起重吊桿

derrickcar || 起重車 | derricks || 起重吊桿 | derriksite || 多硒銅鈾礦,一水銅硒鈾礦

swinging derricks：擺動(dòng)雙桿操作

swinging derrick 搖擺研磨機(jī) | swinging derricks 擺動(dòng)雙桿操作 | swinging fluke anchor 無桿錨