四手的

The second reaction we tested was diastereoselective Michael-Aldol annulation of -keto ester 121 with methacrolein to give a key intermediate for synthesizing (--Huperzine A.

通过对反应条件的筛选，我们得到的最好的结果是以-乳酸苄酯为手性辅基的β-酮酯121i为底物，以(1R， 2R)-环己二胺衍生的手性胍85i为催化剂，以无水四氢呋喃为溶剂，在-20℃反应，得到的产物的de值为73.2%。

Locking may cause administrative problems. Sometimes Harry will lock a file and then forget about it. Meanwhile, because Sally is still waiting to edit the file, her hands are tied. And then Harry goes on vacation. Now Sally has to get an administrator to release Harry\'s lock.

锁定可能导致管理问题，有时张三锁定了文件，然后忘记了，这段时间，由于李四仍然在等待编辑文件，他的手不停的尝试，但是此时张三仍然度假，现在李四必须获得超级管理员权限来释放张三的锁定。

All four practices resemble those used in the former Soviet Union, where every copying machine had a guard to prevent forbidden copying, and where individuals had to copy information secretly and pass it from hand to hand as ''samizdat''.

以上的这四条都像是前苏联的政府用过的招数，在那时的苏联，每个复印机器的前面都站有一个卫兵，来防止机器被用来进行非法的复制。那时苏联人只能秘密的复制信息并且将这些所谓的"地下出版物"信息手手相传。

The E-TOF will also be feasible and practical to assist chemists in screening the optimal reaction condition or evaluating the overall efficiency of different catalytic systems for a specific asymmetric reaction.4.For the first time,we explored chiralγ-hydroxy-α,β-acetylenic esters,which were prepared via asymmetric alkynylation,as key intermediates to the synthesis of chiralγ-butyrolactones. This convergent and enantioselective approach to chiralγ-butyrolactones is practical and easily handled with protecting group free.

这一概念包括反应产率、对映选择性、配体用量以及反应时间四个重要反应参数，不仅适用同一反应不同催化体系的横向综合性评价，而且适用于某一特定反应催化体系的优化过程，有助于研究人员选择最佳的反应条件。4、我们发展了以手性γ-羟基-α，β-炔酸酯为关键中间体完成了手性γ-丁内酯类天然产物的对映立体选择性全合成，该关键中间体能够以我们的催化体系方便的对映选择性合成，之后的官能团转换方法成熟，易于操作，无需进行繁琐的官能团保护和脱保护过程，绿色经济。

240V and 50Hz Luer lock-type reusable needles, metal hub,18 gauge, 40mm, box of 100 Luer lock-type reusable needles, metal hub, 16 gauge, 25mm, box of 100 Luer lock-type reusable needles, metal hub, 14 gauge, 25mm, box of 100 Luer lock-type reusable needles, metal hub, 20 gauge, 30mm, box of 100 Intravenous catheters, 16 gauge, 50mm (2"0) 3 litre intravenous fluid administration bags, with attached tube Simplex IV Bell or equal, high quality latex, 10cm (4") Tubing Kelley Forceps 14 cm, curved Capacity 1 litre, max 1,000 rpm Mayo Dissecting Scissors 14 cm, curved, standard bevelled blades or equal Metal pre-set multi-dose syringe to deliver 0.1ml, with accessories and spares Batch operation for food/meat Portable, for internal determination of foreign bodies in livestock, and magnetic retractor Multi-dose Syringe, 30 ml capacity, adjustable dose of 1-30 ml Henke Vetmatic metal multi-dose syringes, capacity 10 ml with tube feed Nasogastric tubes, 13mm (1/2) outside diameter abd 2.5m (8 feet) long 'Record' type intr-dermal needles as recommended for mclintock syringe or similar Oral dosing syringe for deworming connect various sizes of supply bottles, adjustable dose of 1 to 50 ml Parasite control sprayer back-pack, minimum capacity 10 litre, hand pump for pressure delivery without taking off back.

- 240V的和50 Luer锁型可重复使用的针头，金属枢纽， 18针， 40毫米， 100盒 Luer锁型可重复使用的针头，金属枢纽， 16个指标， 25毫米， 100盒 Luer锁型可重复使用的针头，金属枢纽， 14个指标， 25毫米， 100盒 Luer锁型可重复使用的针头，金属枢纽， 20个指标， 30毫米， 100盒静脉导管， 16个指标，使用50mm （ 2 & 0 ） 3升静脉输液袋，附有管单纯四贝尔或等于高品质乳胶， 10厘米（ 4 &）油管凯利钳十四厘米，弯曲容量1公升，最大转速1000 梅奥解剖剪刀14厘米，弯曲，标准斜切刀片或等于金属预先设定多剂量注射器提供0.1毫升，与配件和备件批量操作的食物/肉便携式，内部确定异物牲畜和磁缩多剂量注射器， 30毫升的能力，可调节剂量的1月30日毫升亨克Vetmatic金属多剂量注射器，容量10毫升管饲料鼻饲管， 13毫米（ 1 / 2 ）外径阿卜德250 （ 8英尺）长'记录'类型中断真皮针头作为建议麦克林托克注射器或类似口服注射器的驱虫连接各种尺寸的供应瓶，可调剂量为1至50毫升寄生虫控制喷雾器回包，最小容量10升，手泵的压力下交付起飞返回。

This article introduced the manipulator, it outputs four groups by PLC to actuate the abscissa axis, the z-axis, the chassis rotation, hand-rotating motor separately, and controls the manipulator abscissa axis and the z-axis pint pointing, the micro switch bequeaths the position signal to the PLC main engine; The electrical machinery drives the hand fingernail and the chassis revolve; The solenoid valve controls air valve the switch to control the manipulator hand fingernail to gather, then realizes the manipulator proper motion function.

本文介绍的机械手是由PLC输出四路来分别驱动横轴、竖轴、底盘转动、手转动电机，控制机械手横轴和竖轴的精确定位，微动开关将位置信号传给PLC主机；电机拖动手爪和底盘旋转；电磁阀控制气阀的开关来控制机械手手爪的张合，从而实现机械手精确运动的功能。

Part Four: Attempt of the Abnormal Beckmann Rearrangement to the Synthesis of Indole Alkaloids Indole alkaloid is one of the most significant important alkaloid and its synthesis is a continuing interesting work.

Scheme 3 〓四、手性吲哚类生物碱的合成初探手性吲哚类生物碱是一类具有重要生物活性的生物碱，它们的合成研究是有机化学家持续感兴趣的课题。

Herein we mainly discuss the design of four series of chialβ-amino alcohols and their application to the asymmetric borane reduction ofprochiral ketones.

本论文主要设计合成了四个系列的手性氨基醇类的催化剂，研究了它们在硼烷对前手性酮的不对称还原反应中的应用。

The first is school badge team and the national flag guards, two students hand printed Yue Yue of two small signs, as well as the four characters of two small round wood as a pioneer, an air of passed the podium, behind a tight guard flag With the later fourth-grade to be outdone, marched their bold and heroic pace, shouting loud slogans, walked the podium, shed their blood, so full of youth!

首先是校徽队和国旗护卫队，两个同学手拿印有岳化二小标志以及岳化二小四个大字的圆形木板当先锋，神气的走过主席台，后面，国旗护卫队紧随其后，四年级也不甘示弱，迈着他们那豪迈的步伐，喊着响亮的口号，走过主席台，洒下他们那充满热血的青春！

Mr. I and plans for half a year want a BB but have not been pregnant this month to the hospital for an examination has been found pregnant as a result of six months but were not pregnant so there is no care to protect their early physical illness is as follows吃了药specific menstruation is the last time I was on the 4th to January 2 (can not recall the specific date that the last two days anyway) cycle for 29-32 days as a result of Kim Jong-January 16 Doctor hospital was opened two days of ofloxacin吊针two bottles a day and oral inflammation hundred net service for three days or not some of the symptoms also had oral Lowe four days after 28 No. Because when cooking large half fingernails cut off after two days due to inflammation of eating cefradine BB always wanted as a result of another failed as Friend introduction has been gradually taking ginseng cream until February 3鹿胎feeling some discomfort to the hospital post-mortem examination urine was very weakly positive on the drug problem at that time ask the director of hospital doctors when she helped me just as long as the operator told me to eat before February 5 in medicine are not all right to ask whether she was in the comfort me?

我和先生计划了半年想要个BB可是一直没有怀上这个月去医院检查验出已怀孕了可是由于大半年都没有怀上所以就没有小心保护自己身体早期因病吃了药具体情形如下我最后一次月经是一月二号还是四号来(具体日期记不起了反正就是这两天)周期为29至32天一月十六号由于泌感到医院看病医生开了两天的氧氟沙星吊针每天两瓶及口服药百炎净服了三天未还是有些症状又口服了洛威四天之后二十八号由于做饭时切掉大半块手指甲后由于发炎吃了两天的头孢拉定另外由于一直想要BB未果经朋友介绍一直在陆续服用人参鹿胎膏直到二月三号感觉有些不适去医院检查验尿呈极弱阳性当时就服药问题问了医院的主任医生当时她帮我算了算告诉我只要在二月五号前吃的药都没什么大碍的请问她是否在安慰我呢？

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