无实用价值的

Comparison of changes in ejection fraction to changes in impedance cardiography cardiac index and systolic time ratio.

无创血流动力学监测对老年隐性心衰的临床意义。实用老年医学， 2008， 22(2)： 159160。[3] 马立业。无创心脏血流动力学监测仪的工作原理、参数意义和临床价值。

And the combination of modern technology the middle glaze firing, so that practical utensils unleaded non-toxic, use of green porcelain, practical and has a high collection value.

以及结合现代科技------釉中烧制工艺，使实用餐具无铅无毒，系绿色环保用瓷，具有较高的实用和收藏价值。

uv air desinfection dynamic control system based on infrared remotecontrol and lowpower at89c2051 is proposed,aiming at disadvantages of traditional air disinfection method.the hardware and software design method is also given.it has characteristics of low power consumption,high speed,highperformance,costeffective and wide application.it is proved that it is convenient,reliable and practicle and so on.

摘 要：针对传统空气消毒方法的缺陷，提出基于红外遥控和低功耗的at89c2051单片机的动态紫外线空气消毒机控制系统，给出系统的硬件组成和硬软件设计方法。该空气消毒控制系统具有消毒无死角，耗电低、速度快、效能高、性价比高，适用范围广等特点。系统在实际使用，证明其方便、可靠并具有实用价值。

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。