The invention discloses a catalytic asymmetric hydrogenation reaction. Of the present invention is the role of chiral catalyst, H2 of the prochiral unsaturated compounds to addition reaction to obtain the chiral product, wherein the solvent used in the reaction liquid polyethylene glycol compound. T.....
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Disclosed is an extendible emergency bump guard post arranged underground comprising a base with open top, a post placed in the base not in use and in vertical place in use and a protecting hood movably connected with one end of the base, wherein when the post is located in the vertical or horizonta.....
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公开了一种腕骨骨折复位和固定装置，其包括：贴靠着使用者的前臂掌侧的前臂掌侧板（２）；连接于所述前臂掌侧板（２）的内侧向板（３）和外侧向板（３’），所述内、外侧向板（３、３’）通过至少一根带状部件（６）分别靠近前臂的内、外侧定位；利用另外的至少一根带状部件（６’）贴靠着使用者手背的手背板（４）；其中，所述内、外侧向板（３、３’）各自通过万向连接装置（５）连接到手背板（４）上，所述万向连接装置（５）允许使用者的腕部沿着任意方向运动，并可以在任意角度固定。
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本实用新型揭示了一种多功能耳机通用转换接口，包括转换接口本体，所述转换接口本体的一端为标准3.5mm的耳机音频接口，另一端为分叉式排列的三接口结构，分别为2.5mm标准耳机接口、5pin耳机接口和10pin耳机接口，本实用新型能够在手机上或者家用音响设备上，自由使用多种耳机，不局限于设备接口，方便快捷，成本低廉。
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For the treatment of fabric or fibers suspended in distilled water solution from 0.1 to 10% of the natural fiber material. Fabric or fibers wetted with the solution 1 to 60 minutes. After wetting the fabric or fibers at a temperature of 80 ~ 160 ℃ dried for 1 to 10 minutes.
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