二叉

We gained the ethynylferrocene in high yield by the the reaction of triphenylphosphine with chloroform or bromoform in the presence of KOBu~t to give witting reagent, which reacted with formylferrocene and then followed by n-butyllithium dehydrohalogenation.

在本论文的第二部分，我们用三苯基磷与溴仿或氯仿在叔丁醇钾作用下，制得三苯基磷甲叉烯，然后与二茂铁甲醛反应，得到二氯取代烯烃，在正丁基锂作用下得到二茂铁乙炔。

With α-D-glucose as raw material, 3-O-benzoyl-1,2,5,6-O-diisopropylidene-α-D-allofuranose was synthesized by isopropylene protection , oxidation, reduction and benzoylation.

以α-D-葡萄糖为原料，经异丙叉基保护、氧化、还原、苯甲酰化反应合成3-苯甲酰基-1，2，5，6-氧-二异丙叉基-α-D-呋喃阿洛糖。

The biramous appendages of an arthropod; long branched hairs on its legson which pollen collects; a forked river; a forked tail; forked lightning; horseradish grown in poor soil may develop prongy roots.

节肢动物的二枝肢体；分叉的河；分叉的尾巴；叉状闪电；山葵在贫瘠的土壤里生长可以长出双叉的根。

Herbs annual or biennial. Trichomes flattened, strongly crisped, simple or minutely stalked and forked.

一年生或二年生草本毛状体使变平，强烈使卷曲，简单和细微偷偷走近并且以叉叉。

The conducting polymer Poly 3,4-Ethylene Dioxy Thiophene thin films was prepared by chemical polymerization. Fourier transform infrared and Scanning Electron Microscope were used to characterize its optical property and morphology. A gas sensor using PEDT thin film was fabricated with the assistance of interdigitated electrodes. The sensitivities of the prepared sensor to toxic NO2 and NH3 and its temperature property were studied.

采用化学聚合法制备了导电聚合物3，4-乙烯二氧噻吩膜，利用扫描电子显微镜和傅里叶变换红外光谱法对薄膜的光学成分及形貌进行了分析，采用叉指电极结构研制出了3，4-乙烯二氧噻吩薄膜气体传感器，研究了3，4-乙烯二氧噻吩薄膜气体传感器对有毒气体NO2和NH3的敏感特性以及其自身的温度特性。

A micro-monolithic column was prepared by in-situ free radical polymerization of stearyl methacrylate with ethylene glycol dimethacrylate in the presence of the initiator AIBN and a mixture of porogens including iso-amyl alcohol and 1,4-butanediol.

以甲基丙烯酸碳酰十八酯为单体，乙叉二甲基丙烯酸酯为交联剂，异戊醇和1，4-丁二醇为二元致孔剂，偶氮二异丁腈为引发剂，原位制备了具有强疏水性的SMA整体微柱，并利用此整体微柱在普通高效液相色谱仪上测定滴眼液中氧氟沙星的含量。

The 1,3-2,4-di (3,4-dimethylbenzy-lidene) xylitol was synthesized by means of aldol condensation reaction with xylitol and (3,4-dimethyl) benzaldehyde as raw materials and paratoluenesulfonic acid as catalyst.

以木糖醇和3，4-二甲基苯甲醛为原料，在酸催化下进行醇醛缩合反应，合成了1，3-2，4-二（3，4-二甲基）苄叉木糖醇。

Herbs annual or biennial. Trichomes sessile and stellate, sometimes mixed with simple or forked ones.

一年生或二年生草本毛状体无柄和星状，有时与简单或者以叉叉的东西混合。

Herbs annual or biennial. Trichomes simple, mixed with short-stalked, forked smaller ones.

一年生或二年生草本毛状体简单，与短茎，以叉叉的更小的混合。

Shanghai Aerospace business scope: 1: wooden pallets (alias: fork plates, pallets, pallet, storage board, mat storage board, shovel plate) into the two side pallet fork, pallet fork into four, one-sided tray, double-sided pallet, export pallet to avoid fumigation exemption, plywood pallet, plywood pallet.

上海宇航木业有限公司经营范围： 1）：木托盘（别名：叉板、栈板、货盘、货仓板、垫仓板、铲板）二面进叉托盘，四进叉托盘，单面托盘，双面托盘，出口免熏蒸免检托盘，胶合板托盘，夹板托盘。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐