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Unlike the famous standard Mauser cation, the Gehmann bolt has cocking handle near the front end of the bolt, and the receiver has a split bridge.

与著名的标准毛瑟阳离子的Gehmann螺栓已握把附近螺栓的前端，并接收了一些分裂的桥梁。

The technology of emulsify-cation in the way of ultrasonic wave and mechanical stir is widely investigated. Factors having influence on stability of emulsions produced in two ways is carefully explored, and the law of parameters of emulsification technology which affect the stability of emulsions is obtained. The two ways are compared, their scope of application is clear.

对用超声乳化法和机械搅拌法制备乳化液的工艺作了深入的研究，细致地探讨了影响乳化液质量的因素，摸索出各乳化工艺参数的影响规律，并且对两种乳化方法作出了比较，得出了它们各自的适用范围。

Independently tested, LXT PVC provides superior resistance to regular PVC for leaching of anion, cation, and numerous trace metals when subjected to 18.2 megohm deionized water while maintaining ease of installation.

经过第三方独立测试，对于19.2兆欧姆去离子水，LXT PVC对于阴离子、阳离子和许多痕量金属的滤去具有极高的耐抗性，同时还保持安装的简便性。

The editor has written a substantial Introduction that provides students with a historical and contex-tual overview, from In Memoriam＇s genesis to its publi-cation and reception.

这本书带给读者的不仅是当年的血雨腥风、刀光剑影和伏尸千里的悲壮惨烈，更应该是一种对历史的反思和一种对和平挥之不去的责任。

Recent progress on surface modifications of TiO2 doped by metal cation and metalloid anion has been summarized,based on the findings reported in the present literatures.

早期的研究主要集中在悬浮体系即TIO：粉末上，但目前悬浮相TIO：光催化剂在水中易凝聚、易失活、且使光的穿透力受阻，尤其是处理后的光催化剂分离与回收的难题已成为该项技术能否工业化的关键。

The possibility of preparation of methylal from methanol and formaldehyde through slurry catalytic distillation catalyzed by acidic cation exchange resin with large size pores is discussed.

研究了以甲醇和甲醛为原料，以大孔径强酸性阳离子交换树脂为催化剂，通过浆料催化精馏工艺制备甲缩醛的可行性。

Density functional theory was applied to investigate the gas-phase reaction mechanism of chromium hydride removing from reaction of chromium cation and methylamine.

利用密度泛函理论重点研究了Cr+与CH3NH2反应生成CrH的气相反应机理。

Due to the ability of the bivalent magnesium cation to form stable chelate complexes with carbonyl compounds,magnesium methylate for example is used as a selective carbonyl condensing agent. Three synthesis routes was proposed based on literatures and comprehensive comparison with other ways. First,Magnesium methylate is prepared by reacting magnesium metal with dry methanol.The magnesium salts of"higher"primary alcohols,i.e.alcohols with ≥ 2 carbon atoms,do not react directly with pure alcohols under normal conditions.In fact catalysts are required to set the reaction in motion and the preparation is performed under pressure at the higher temperatures.

一、直接合成法：本文将镁与无水甲醇直接反应制得甲醇镁；"更高级"的醇（比如C≥ 2的醇）在无催化剂的条件下无法直接和镁进行反应，本文以CCl4为催化剂将无水乙醇与镁直接反应制得乙醇镁，但是以原甲酸三乙酯为催化剂无水乙醇与镁无法反应；不论是以CCl4为催化剂还是以原甲酸三乙酯为催化剂，丙醇均无法与镁直接反应。

Due to the ability of the bivalent magnesium cation to form stable chelate complexes with carbonyl compounds,magnesium methylate for example is used as a selective carbonyl condensing agent.Three synthesis routes was proposed based on literatures and comprehensive comparison with other ways.First,Magnesium methylate is prepared by reacting magnesium metal with dry methanol.The magnesium salts of higherprimary alcohols,i.e.alcohols with ≥ 2 carbon atoms,do not react directly with pure alcohols under normal conditions.In fact catalysts are required to set the reaction in motion and the preparation is performed under pressure at the higher temperatures.

一、直接合成法：本文将镁与无水甲醇直接反应制得甲醇镁；"更高级"的醇(比如C≥2的醇)在无催化剂的条件下无法直接和镁进行反应，本文以CCl_4为催化剂将无水乙醇与镁直接反应制得乙醇镁，但是以原甲酸三乙酯为催化剂无水乙醇与镁无法反应；不论是以CCl_4为催化剂还是以原甲酸三乙酯为催化剂，丙醇均无法与镁直接反应。

Using the parent line is important. It minimises differences in the diet so that the impact of genetic modi ? cation stands out. And it did.

使用亲本玉米是很重要的，它可以把食品的不同之处最小化，从而突出基因改造的影响，试验起到了这种作用。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。