可一致化的

D-Pantothenyl alcohol, also called ortho-vitamin 85, is an important nutrition suppled substance. It has been widely applied in the field such as medicine, cosmetic, foodstuff, feed additive, and so on. The preparation of D-pantothenyl alcohol and the optimization of key factor are discussed mainly in this paper. It mainly includes three section.In the first section, with formaldehyde, isobutyl aldehyde and diethyl oxalate as the starting materials, D-pantolactone is prepared via three steps including condensation, catalytic hydrogenation and physical resolution. The specific rotatory power of the product is consistent with imported product.

D-泛醇，俗称原维生素B_5，属维生素B旋类营养增补剂，广泛应用于医药、化妆品、食品、饲料等领域，本文着重探讨了其制备及关键因素的优化，主要内容可分三部分：第一是D-泛内酯的制备，先以甲醛、异丁醛和草酸二乙酯为起始原料合成酮基泛内酯，再经催化氢化得到DL-泛内酯，然后通过物理拆分获得D-泛内酯，得到产物的比旋光度与进口产品基本一致。

Traditional concurrency control methods constrain the concurrency of transactions and are disadvantageous to satisfaction of Real-Time transactions' timing constraints. We develop a novel quasi-consistent serializable concurrency control strategy. The inconsistency brought by transactions to the system was restricted to an extent.

传统的并发控制策略限制了事务执行的并发度，对实时事务定时限制的满足是不利的，我们开发了一种适合于实时应用环境的新颖的&准一致性可串行化&并发控制方法，事务给系统带来的不一致程度被限定在一定范围内。

This paper considers the problem of view self-maintenance, where the views are maintained without base database, including how to maintain a view and determining whether a view is maintainable.

由于延迟视图维护机制允许修改事务在全局视图没有进行相应的改动之前提交，有暂时的数据不一致情况出现，在这种情况下，即使严格的ZPL协议也不能保证全局事务的可串行化执行。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。