Aiming at the frequent occurrence of drill-string fracture during gas drilling in the Puguang gas field, this paper, based on the statistical analysis of accidents on fields, makes in-depth investigation into the origins of drill-string accidents in aspects of peculiar drilling medium, different rock-breaking methods, and the vibration of drill string during the drilling process. Through macro, micro and material analysis of the fracture surface of drill string, the law of drill-string failure due to fracture is discovered and the fatigue fracture is found out to be the main type of drill-string fracture.

針對(duì)普光氣田氣體鉆井過程中存在的鉆具斷裂頻繁的問題五级黄18以上欧美片，在對(duì)現(xiàn)場(chǎng)事故統(tǒng)計(jì)分析的基礎(chǔ)上九色高清bb在线视频，從特殊的鉆井介質(zhì)黄色网站午夜看、不同的破巖方式以及鉆井過程中鉆柱共振等方面定性分析了鉆具斷裂的原因永久黄网播放站色视频免费；通過對(duì)鉆具斷口宏觀、微觀及材質(zhì)分析欧美资源自慰，找到了鉆具斷裂失效的規(guī)律和主要形式－疲勞斷裂色色色免费色。

Although the blowout after the shock return to the market trend, but due to the policy of a strong combination of boxing out, making investors look forward to the A shares bottomed heating up.

盡管井噴后的沖擊重返市場(chǎng)的趨勢(shì)，但由于一拳擊出強(qiáng)大的組合政策2020国内偷拍，使投資者期待A股見底升溫干在线永久免费视频。

Never getting out of the starting gate properly due to poor selection criteria and not knowing exactly what to look for in a successful company.

由于較差的選股準(zhǔn)則和不能確切地懂得要尋找什么樣的成功公司，從來沒有完全走出起點(diǎn)久久性网。

A good many of historic stones exposed out-of-doors are badly damaged due to natural and human factors .

暴露在野外的眾多大型石質(zhì)古跡日韩人妻无码免费视频一二区色，由于自然因素的風(fēng)化作用和人為因素的破壞欧美精品亚洲精品日韩传电影，許多表面劣化現(xiàn)象嚴(yán)重。

Out-of-doors video media is easy to be accepted due to the characteristic of TV spreading: both seeing and hearing, the program is becoming more and more abundant as well.

我國(guó)戶外廣告的發(fā)展正在呈不斷上升的發(fā)展趨勢(shì)在线精品视频小网站在线，尤其是北京天堂av.com、上海、廣州三地人人操wwwcom，它們一直是戶外媒體發(fā)展最快91黄色视频在线免费在线观看、最成熟的城市。

Out-of-doors video media is easy to be accepted due to the characteristic of TV spreading: both seeing and hearing, the program is becoming more and more abundant as well.

戶外影像媒體易于被人們所接受国产黄色精品亚洲一级片AV，具有電視傳播的特色：視聽兼?zhèn)浯直┐蠛邙K巴视频欧，播放的?nèi)容也日顯豐富多樣。

A new search is also due to be carried out for mass graves that may contain more victims of human experiments.

另外精品在线电影，一項(xiàng)面對(duì)墓穴的新研究正在進(jìn)行中jizzjizz小视频。這些墓穴埋葬著化學(xué)部隊(duì)做實(shí)驗(yàn)的遇難者。

Itwas found that the"out-group"antiparticles of Bose type, which came into being because of CP ( charge conjugation-parity conservation) violation in the early universe and became heavier due to the phase transformation from low temperature to high temperature, are the supersymmetry companionsof the"in- group"particles of Fermi type.

研究了編內(nèi)粒子和&編外&粒子的對(duì)稱性欧美亚洲自慰，發(fā)現(xiàn)因宇宙早期CP破壞導(dǎo)致從低溫到高溫的相變而變重的玻色型&編外&反粒子是費(fèi)米型編內(nèi)粒子的超對(duì)稱伴子。

It points out that though 19th century Utopian Socialism criticized the traditional religion and the church , it failed to draw a clear demarcation between religion and itself due to its historical constraints.

指出了19世紀(jì)的空想社會(huì)主義雖然對(duì)傳統(tǒng)宗教和教會(huì)進(jìn)行了批判欧美操屄视频网，但由于歷史條件的限制黄色网站网址在线视频，19世紀(jì)的空想社會(huì)主義還不可能與宗教劃清界限。

The advantage using the lignin as the raw stuff was analyzed and it was also pointed out that the lignin has wide prospects in China. Judging from the mechanism of CWS additives, the difference between polystyrene sulfonic sodiums and naphthalene sulfonic condensations is due to the different adsorption ways.

從煤的分散機(jī)理方面闡述了聚苯乙烯磺酸鈉與亞甲基磺酸鹽兩類添加劑的差異在于吸附方式的不同影音先锋性资源免费，指出了木質(zhì)素作為水煤漿添加劑的優(yōu)勢(shì)及其在我國(guó)利用的廣闊前景4455www在线看片。