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This paper introduces the structure and operating principle of a new efficient underreamer which is provided with backreaming and gage protection.

针对国产常规扩孔器存在切削效率低，保径效果和倒划眼功能差的现状，设计了一种具有倒划眼和保径功能的BG型高效扩孔器，并对BG—118型扩孔器的水力推进机构、切削块伸缩机构和切削系统进行了设计计算。

The hydraulic push mechanism,cutting-block retract mechanism and cutting system of BG-118 underreamer have been designed and calculated.

针对国产常规扩孔器存在切削效率低，保径效果和倒划眼功能差的现状，设计了一种具有倒划眼和保径功能的BG型高效扩孔器，并对BG—118型扩孔器的水力推进机构、切削块伸缩机构和切削系统进行了设计计算。

Pit corrosion is a main kind of localized corrosion. The process of forming pit corrosion includes three stages-formation of pit source, development of pit cave and forming occluded corrosion cell. Molybdate series inhibitors can be inhibitive, for it can control three stages of pit development. First, there is apparent synergistic effect between molybdate and phosphate, which can suppress formation of pit source. Second, there is apparent passivation of molybdate inhibitor according to electrochemistry analysis, which let oxidation film in unoccluded cave repassivate.

首先，钼酸盐与磷酸盐或硅酸盐复配的缓蚀剂具有较理想的缓蚀性能，并且有明显的协同作用，从而能抑制部分点蚀核的产生；其次，钼酸盐复配缓蚀剂的使用，从电化学的角度分析，具有明显的钝化性能，且钝化区间较宽、维钝电流密度较小，从而能使未封闭的蚀孔或点蚀核附近的氧化膜再钝化，得到有效的修复；最后，对于还有部分蚀孔发展成为闭塞腐蚀电池的情况，钼酸盐、磷酸盐能进入蚀孔内部并且在酸性条件下生成铁钼磷酸盐，从而有效地减缓了点蚀的恶化，抑制了腐蚀的发展。

The purpose of the gross and the clamps design for assailing silk on the body crest face of the D3115 diesel engine machine is to be accord with the size request of 43,83, and 71 when processing the 14 threads.For satisfying the request of producing rate,and because of the number of the threads is numerous.we adopt the single work form combination machine to carry out processing of the threads.

D3115，柴油机机体顶面攻丝机床总体及夹具设计的目的是使在3115柴油机机体上加工14个螺纹孔M14-6H时，在14个螺纹孔间符合43、83、71尺寸要求，且为了满足生产率的要求，顶面的螺纹孔数量较多，特采用立式单工位形式的组合机床对多孔进行攻丝加工。

At carbonizing temperature between 425 ℃ and 720 ℃,the micropore volume is between 0.124-0.222 mL/g. Surface of the carbon is also observed by scanning electron microscopy. During thermogravimetric analysis,the cell wall of coconut shell disassembles to form macropore at μm level while its cellulose structure was retained.

本研究还探讨了椰壳炭的孔结构参数，炭化温度 4 2 5～ 72 0℃，其微孔容积为 0 。12 4～ 0 。2 2 2mL / g ，并用扫描电子显微镜观察了椰壳炭的表面形貌，椰壳在热分解时，细胞壁分解形成了微米级的大孔，并保留了椰壳的纤维状结构。

The design scheme was also disserted as the system using the capacitance sensor to measure the aperture of small holes.

论述了小深孔内径电容式测量方法的基本原理，设计了电容式深孔内径测量仪测量小深孔孔径系统的总体方案。

The occurrence of the apical lateral foramina is 15.31%(230/1502).Conclusions The apical lateral foramina are found in 1/7 of 1 502 permanent teeth.

恒牙根尖部侧孔的孔径为根尖孔的一半，并约有1/7的恒牙出现根尖部侧孔。

Ou Fu the pore filter plant Limited company founded in 1999 is mainly en gaged in filters the splitter, the specialized production porepurifier, purified oneself the type filter elem ent purifier, as soon as the muddylike filter element purifier, bag the type purifier, the Pe pore filter pipe, the stainless steel filter element, the filter pocket and so on, was domestic solid crosses splitter's the largescale production base.

欧尔福微孔过滤设备有限公司创建于1999年主要从事过滤分离设备，专业生产微孔过滤机，自清式滤芯过滤机，烛式滤芯过滤机，袋式过滤机，PE微孔过滤管，不锈钢滤芯，滤袋等，是国内固液分离设备的大型生产基地。

The porous Ti shows a three-dimensional open-cellular structure with two types of pores:one is inter-connection pore with uniform distribution;the other is small isolated smaller pore distributed in the wall of the open interpenetrated pores.

多孔钛具有三维连通的孔隙结构，其孔可以分为两种：一种是分布均匀、而且相互连通的宏观孔隙；另一种是分布在开放贯通的大孔壁上，孤立的近似球形的微孔。

When secondary building units characteristic of zeolite Beta detected by FT-IR appeared in the reaction mixture in the absence of crystals of zeolite Beta, the pre-treatment was terminated. The aluminosilicate gel with seconding building units characteristic of zeolite Beta was led to ordered-channel hexagonal mesoporous molecular sieve by the interaction between liquid-crystal micelles formed by the self-assembly of surfactants and pre-treated alumiosilicate gel. Therefore, the mesopore wall of SBU mesoporous materials showed the structural character of zeolite Beta.

当反应混合物出现用FT-IR可以检测到的Beta沸石次级结构单元且又没有生成Beta沸石晶体时，即刻终止预处理过程；然后利用表面活性剂超分子自组装形成的液晶胶团与经过预处理的无机物种通过界面作用把含有Beta沸石次级结构单元的无机物种导向为有规整孔道结构的六角中孔分子筛，这种SBU中孔材料的孔壁因而具有Beta沸石的结构特征。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。