头

During the manufacturing of the critical intermediate cephalosporin nucleus --7-amino-3-chloro-cephalosporanic acid diphenylmethyl ester hydrochloride salt, first the feasibility of the one-pot synthetic route of open loop, closed loop and ozonization when chlorine is passed over is qualified by experiments. Then the critical factors that will influence this reaction are studied as follows: the mol ratio of triphenyl phosphite and Diphenylmethyl 3-hydroxy-7-phenylacetaminoceph-3-em-4-carboxylate-l-oxide is four to one; the quantity of the stablizer should be at least more than two to one. The temperature of the system must be 25℃ when chlorine is passed over so that the hydrochloride can be precipitated to obtain cephalosporin nucleus of cefaclor--7-amino-3-chloro-cephalosporanic acid diphenylmethyl ester hydrochloride salt.

在制备关键中间体头孢母核7-氨基-3-氯头孢烷酸二苯甲酯盐酸盐时，先通过实验验证把开环、闭环、臭氧化三步在通入氯气时并为一锅煮的合成路线的可行性之外，又研究了影响该反应的几个重要因素：亚磷酸三苯酯与3-羟基-7-头孢烷-5-亚砜-2-甲酸二苯甲酯的摩尔比为4：1；稳定剂2-甲基-2-丁烯的用量至少大于2：1，通入氯化氢气体时体系温度在25℃时盐酸盐则能够顺利析出，获得头孢克洛的头孢母核—7-氨基-3-氯头孢烷酸二苯甲酯盐酸盐。

Results:(1)Head length and maximum circumference of the head,minimum frontal width and extracanthic diameter,morphological facial height and physiognomic facial width were correlative.

结果 ：(1 )头长与头水平围、额最小宽、两眼外角宽、形态面高与容貌面高相关；(2 )头水平围与头面部很多项目都相关；(3 )头面部及五官的宽度项目彼此间密切相关，而与高度项目相关不显著；(4 )头面部及五官的高度项目彼此间存在一定程度的相关。

The product mainly serves the die making…The main product includes: The drift, floats rises the tree top/roof bar, the request needle, the flat thimble, the guide pillar, the guide sleeve, the auxiliary/ball bearing guidance, the independent guide pillar, the pould frame, the ball bearing wrap, the date chapter, the punch press safety/sheet iron separator, the counter, the mold spring, the filter, the contour sleeve, the feather piece, hit the screw, the roof bar, Si Tong, the runner wrap, silver steel, the screw rod, the nut, the engine bed appendix, the anaerobic glue water, the rust-preventing agent/release agent, the side lathe tool, a Yuan lathe tool, the flat lathe tool, the tipped tool, the grinder to approve the gentleman the milling cutter, to drill ju, the screw die, the thread chaser, the spanner, the polishing polish thing, the thread plug gage, the resin shutter, the suspension loop, wash the slate pencil, the cowhide wheelhead, the rubber wheelhead, the steel figure, the wool wheelhead, the sponge the wheelhead, the red lead, the emery paste, the province copper paste, the oilstone, the diamond attrition fat stone, to divide the stick, in six jiao spanners, the measuring instrument, to drill the cartridge, to frustrate the knife, the knife handle, the knife grain, to stop the cock, the molybdenum silk, the dresser, the cutting piece and so on nearly hundred kind of mold hardware fitting.

产品主要服务于模具制造…主要产品有：冲头、浮升梢/顶杆、托针、扁顶针、导柱、导套、辅助器/滚珠导向件、独立导柱、模架、滚珠套、日期章、冲床安全器/铁板分离器、计数器、模具弹簧、过滤器，等高套筒、销钉、塞打螺丝、顶杆、司筒、浇口套、银钢支、螺杆、螺母、机床附件、厌氧胶水、防锈剂/脱模剂、方车刀、元车刀、扁车刀、焊接车刀、磨床批士铣刀、钻咀、丝攻、板牙、扳手、抛光打磨用品、螺纹塞规、树脂开闭器、吊环、洗石笔、牛皮磨头、橡胶磨头、钢字码、羊毛磨头、海棉磨头、红丹、钢砂膏、省铜膏、油石、钻石研磨膏油石、分中棒、内六角扳手、量具、钻夹头、挫刀、刀把、刀粒、止水栓、钼丝、打磨机、切割片等近百种模具五金配件。

The second step, dividing the sternocleidomastoid just below and with preservation of its upper attachment for closure and reflecting it laterally exposes the upper extension of the splenius capitis.

第二层，可见头夹肌和头半棘肌上部。头夹肌附着于上项线，分离头夹肌，在其上部附着点保留一小肌袖以便缝合，并将其向内侧翻开，显露头最长肌和头半棘肌。

Marc to design folg club and investigate the physical phenomenon of impact between golf club head and golf ball. In order to find out the maximum vom mises stress and permitted wall thickness of different materials for golf club, the stress distribution and propagation of different golf club heads are studied.

Marc结合起来，设计球头，分析高尔夫球头与球碰撞的物理现象，寻求击球瞬间球头所受到的应力冲击及球头各部位的应力状态，从中寻找不同的球头材料所受到的最大应力及允许壁厚，为球头产品的开发、性能评价提供依据。

The utility model comprises a pair of two-section rod, a pair of three-section rod, the dismountable gun head, cutter head, sword head and fork head, etc. Mutual connected and dismountable screw threads are arranged between every two sections of the rod, and the screw threads on the rod end are also arranged on the attachments such as a gun head, a cutter head, a sword head and a fork head.

该实用新型包括一个对两节杆，一对三节棒， dismountable炮头，刀头，剑头和叉头，等互相连接，并dismountable螺纹均安排之间每两节的棒，以及螺纹对杆端也安排实习，例如一炮头，刀头，剑头和一个叉子头。

The result of frozen MⅡoocytes using three methods indcated that the self-restraintspear method was better than OPS, and the effection of frozen altogether with self-restraintspear method and centrifugal was the best; the frozen effection was not ideal using fluidspear for 8- cell ovocyte.

用三种冷冻方法(OPS法；自制移液枪头法；移液枪头法+离心法)对MⅡ卵母细胞冷冻的结果表明，自制移液枪头法优于OPS法，其中以移液枪头法+离心组的冷冻效果最好；用移液枪头法对体外发育到8-细胞期卵母细胞的冷冻效果不理想。MⅡ期卵母细胞用OPS法冷冻后卵母细胞IVF和电激活的卵裂率都显著高于移液枪头法(P＜0.01)，电激活后2-细胞卵裂率比IVF高。

The conditions to measure accurately and the principles to select parameters of the multi— probes EST method are proposed, and the theoretical research, computer imitation and the experiment on a machine tool prove that these principles and suggestion are necessary and effective. The influence of the initial value errors of the probes, the installation error of the probes system, and the remaining error caused by the radical error motion are analyzed quantitively on the measurement accuracy of the multi—probes EST method. The influence of the error caused by the probe's axes which is not in a plane and the perpendicularity error of the plane which the probe's axes is in to the stational axis are discussed on the measurement results.

结合理论分析，对这些EST方法进行了计算机仿真分析和研究，重点研究了这些方法的应用条件和误差分离精度，所得出的结论是：三测头法EST基本上能实现各项误差的完全分离，适于在位测量使用；二测头法在恰当地选择测头安装角的条件下，可以得到较高测量精度，适于大型零件圆度、圆柱度、径向圆跳动和全跳动的在位测量；对置两测头时域法可以在一定程度上改善单测头法测量精度，但对随机径向误差无能为力；对置两测头频域法存在严重的谐波损失。

Main products include: High Precision Universal Boring Head, Spring Collet, Tap Collet, Quickly-exchanging Collet, Speed-increased Cottet, High-force Spring Collet, Drill Collet, High Precision Tool Holder, High Precision Indexing Taper Gauge, Extension Bar, Type CSG Tooling System for CNC Turning Machine and CNC Taper 7∶24 Tooling System for CNC Machining Center.

&马牌&产品规格齐全、质量稳定，畅销世界各地，在国内外享有声誉，生产产品有精密万能镗头、弹簧夹头、攻丝夹头、快换夹头、强力型弹簧夹头、钻夹头、精密刀杆、高精密度圆锥量规，各类接杆以及数控车床CSG型工具系统和数控加工中心7∶24锥度各种数控工具系统等。

The company mainly produces Dan Huangjia head, milling chucks, needle-strong milling chuck, chuck Modao Ji, instrument lathe chuck, chuck Zhitong, NC knife handle.

公司主要生产弹簧夹头、铣夹头、滚针式强力铣夹头、磨刀机夹头、仪表车床夹头、直筒夹头、数控刀柄。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷