According to various of the technical difficulties such as low drilling efficiency in hard rock and short service life of diamond drilling bit, analysis was made on the inherent links between blade-extruding of hot-pressing diamond and rock abrasiveness.

中文摘要：針對(duì)在堅(jiān)硬致密巖石中鉆進(jìn)時(shí)效低和鉆頭使用壽命短的技術(shù)難題，分析了熱壓鉆頭的金剛石出刃與巖石研磨性等巖性之間的內(nèi)在聯(lián)系15yc午夜福利在线视频，認(rèn)為鉆頭的胎體成分及其性能是關(guān)鍵，硬而帶脆性的胎體性能有利于金剛石出刃，從而能提高鉆進(jìn)速度com碰。

In order to solve the problem of low efficiency and short service life of hot pressed diamond bit when drilling in hard and compact formation, relations between diamond exposure of hot pressed bit and rock abrasiveness were analyzed in this paper. Research on matrix performances of hot-pressed diamond bit was firstly carried out.

針對(duì)在硬而致密巖石中鉆進(jìn)時(shí)效低的難題，本文分析了碳化鎢基熱壓鉆頭的金剛石出刃與巖石研磨性等巖性之間的內(nèi)在聯(lián)系欧美欧美欧美性爱网，認(rèn)為鉆頭的胎體成分及其性能是關(guān)鍵一级日本特黄牲交大片在线，硬而帶脆性的胎體性能有利于全剛石出刃，從而能提高鉆進(jìn)速度色色五月天导航。

Results Sort the risk factors by turns according to OR value, threatened abortion, insecticide, oestrogenic hormone, tocolytic agent, organic solvent,abstergent, subcalorism and mal-medication in inchoated duration of pregnancy,conceptus age7 weeks.

結(jié)果：危險(xiǎn)因素按OR值排序亚洲自拍偷拍图，依次為先兆流產(chǎn)、殺蟲劑、雌激素免费黄色视频地址、保胎藥殴美性生活视频、有機(jī)溶劑、洗滌劑www.亚洲网、孕早期感冒国产污视频在线免费看、孕早期不當(dāng)用藥、胎齡7周一本大道无码av一二三区。

AIM To study the application of air sac obstetric apparatus in natural vaginal labor and its role in avoiding the conventional cesarean section in abnormal position of fetal head and the breech presentation with normal weight i nfants.

目的 通過對(duì)胎頭位置異常120例及臀位60例施行氣囊助產(chǎn)術(shù)研究尤物黄色录像视频大全观看视频，可使多數(shù)按常規(guī)處理應(yīng)行剖宮產(chǎn)術(shù)的胎頭位置異常者轉(zhuǎn)化為陰道分娩，還能順利解決正常體質(zhì)量之臀位經(jīng)陰道分娩黄色大片二区。

The thesis analyzes all kind of the traditional chinese medicine literature that cured amenorrhea from Han Dynasty till now by means of literature research.

本文通過文獻(xiàn)研究的方法天堂网视频在线播放，對(duì)古代各類中醫(yī)文獻(xiàn)所記載的妊娠養(yǎng)胎安胎食物藥物宜忌相關(guān)資料進(jìn)行了分析研究。

Local causes of uterine atony is the twins, fetal macrosomia, polyhydramnios, etc., uterine muscle fibers over-extended, over-expansion of the uterus, resulting in reduced post-partum resumption of non-performing.

宮縮乏力的局部原因就是雙胎Www.生活片、巨大胎兒国产黄色视频免费在线观看www.、羊水過多等，子宮肌纖維過度伸展人人插人人肏，子宮過度膨脹99精品久久只有精品三级，造成產(chǎn)后縮復(fù)不良。2黄色网站毛篇、如果生第二胎8x国产精品V片在线，同樣的事情未必會(huì)發(fā)生。

Parents should pay special attention to whether the baby bronchiole issues, or whether there痰多caused by respiratory obstruction, and that leads to the causes of neonatal respiratory distress include: low birth weight, the mother has a history of diabetes, premature rupture of membranes, meconium pollution, birth mother irregular fetal heart tone, prolapsed umbilical cord, the fetus had cooked, prematurity, multiple births, chest, heart or respiratory abnormalities.

家長要特別留意寶寶是否有細(xì)支氣管方面的問題秋霞理论理论视频免费看，或是否有痰多造成呼吸阻塞的現(xiàn)象精品剧情日韩欧美在线观看网站免费，導(dǎo)致新生兒呼吸窘迫的原因包括：出生時(shí)體重過低、母親有糖尿病史美国一级草草、胎膜過早破裂91人妻中文字幕无码专区、胎便污染、媽媽分娩時(shí)胎心音不規(guī)則人人操人人涩、臍帶脫垂国产精品久久久久国产这里有精品、胎兒過熟、早產(chǎn)强奷迷奷无码片、多胞胎91在线无码精品播放、胸腔、心臟或呼吸道異常一级av在线播放网站。

You say it is child bud, but also 60 days after birth in order to shoot to see.

你說的是胎芽吧一级黄色片免费偷拍视频，不過胎芽也要60天后才能看到的。

Materials and Methods The primary osteoblasts separated from calvarium of 10 fetal rats were cultured and a finite cell line was established in vitro.

材料和方法選用SD胎鼠顱骨作為細(xì)胞原代培養(yǎng)的組織來源中日韩精品美女在线观看视频网站，建立胎鼠成骨細(xì)胞有限細(xì)胞系日本wwws。

Normal rat embryos and embryos with ARM from gestational days 12.5 to 20 were sectioned serially and sagittally and stained with HE to observe development of cloaca and anorectum continually and contrastively.

胎齡12.5天-20天的正常及泄殖腔發(fā)育畸形的胎鼠正中矢狀面連續(xù)切片日韩欧美三级，HE染色，連續(xù)動(dòng)態(tài)對(duì)比觀察泄殖腔及肛門直腸的發(fā)育過程91国内。