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.

針對在硬而致密巖石中鉆進(jìn)時效低的難題，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)系一级a作爰片A级毛片，認(rèn)為鉆頭的胎體成分及其性能是關(guān)鍵全国在线无码精品，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)速度无码欧XXXX在线观看。

Hawk Any of various birds of prey of the order Falconiformes and especially of the genera Accipiter and Buteo, characteristically having a short, hooked bill and strong claws adapted for seizing.

鷹：任何種類的有短且為鉤狀的喙和適于捕捉的利爪的隼形目肉食性飛禽bbixx.com，尤指鷹屬及鷸屬動物

He forgot that the "Central blocking, non-sheltered Day","wearing a short brown knot live in repeated air scoop" the hardships of life, in order to in this small world in to satisfy the demands of his nature, a pair of homing birds go hand in hand over his eyes, he "There is there is true, others want to forget words dialectic."

他忘卻了那"環(huán)堵蕭然，不避風(fēng)日"日韩欧美A片一级久久72、"短褐穿結(jié)国产色视频一区，簞瓢屢空"的艱辛生活，為能在這片小天地里放逸他的天性而滿足黄页视屏在线看。剎時日韩欧美中文精品第一页，一對結(jié)伴歸巢的鳥兒掠過他的眼前，他怡然自得："此中有真意色色av无码，欲辯己忘言思思精品视频。"

Because of short of power sources in the altiplano, very long feed line of power distribution system have to be used when one of the substations is failed to operate, in order to g.

由于正在建設(shè)中的青藏鐵路地處高原、電源稀缺欧美黄色小视频在线，在某些變電所退出運行的情況下久久精品伊人不卡一区，不得已采用超長距離供電以保障對沿線負(fù)荷的電力供給，因此国产春色一级视频免费，超長距離供電線路的單相接地故障選線問題值得研究美国黄片一级片。

In order to complete a design of a frame of Off-axis Three-mirrors Anastigmat telescope in a short time, this paper gives the design cycle based on FEM, whose main method is topological optimization. This application is completed by HyperMesh/OptiStruct/Rodioss which are offered by Altair Engineering, Inc.

為了在短期內(nèi)完成一套離軸三反系統(tǒng)支架以及附件的設(shè)計，本文基于有限元方法的設(shè)計流程国产福利在线99，以拓?fù)鋬?yōu)化為主色综合综合热视频，在Altair公司的HyperMesh/OptiStruct/Rodioss系列軟件的平臺上，完成了設(shè)計任務(wù)一级毛片A片免费播放。

The electric needle of different interpose order and rehabilitation treat conclusion, head of sex of kitchen of play a game of chess is short of the refreshment of function of hematic bandicoot motion to have apparent effect, and the effect of set of the shot after moving first is relatively apparent.

結(jié)論不同干預(yù)次序的電針及康復(fù)治療99人人摸人人干，對局灶性腦缺血大鼠運動功能的恢復(fù)有明顯的影響，且先運動后針組的影響較為明顯久久久毛片久久久。

This short activity asks the students to arrange lines from a conversation into the proper order.

這個小練習(xí)要求學(xué)生們將談話中的句子按先后順序重新排列欧美一级特黄色视频。

To fire beyond and short of in order to determine artillery range.

一種能在相對近的射程內(nèi)高角度射擊的大炮。

After a year they were allowed to take the missionary oath, and after a second year they returned to their provinces until a vacancy in one of the missions necessitated the appointment of a new labourer; by these means the order was prepared to send out efficient subjects at very short notice.

一年后黄片拍拍视频免费视频强奸，他們被允許以傳教的誓言后自拍视频日韩在线，第二年，他們返回自己的省份免费无码不卡a片，直到出現(xiàn)空缺的使命之一亚洲日本综合图区，有必要任命一名新的勞動者操人免费网站，通過這些手段，該命令已準(zhǔn)備送出去93一区=区三区持级黄色毛片，有效地科目在極短時間內(nèi)国产原创激情在线观看网站视频下载，恕不另行通知。

Besides, influence of atomic number on the numbers of residual bond and short-range order atom also was analysed.

同時国产强伦姧在线观看，分析了原子序數(shù)對熔體中剩余鍵數(shù)和近程有序原子數(shù)的影響啪啪精品福利。