The phenomenon of water hammer is an objective reality, in order to ensure the safety of the system, we must take active preventive measures; to minimize the occurrence of the phenomenon of water hammer, valve heating system piping is a very important component, this study only Back to the valves in the heating system water hammer Check Valves effect, established the last time when the valves open and close the boundary conditions.
水锤现象是客观存在的，为了保证系统的安全，必须采取积极的预防措施；尽量减小水锤现象的发生、止回阀是供热系统管路中一个十分重要的部件，本文研究了止回阀在供热系统中的防水锤作用，建立了上回阀启闭时的边界条件。
Most conventional measures of our blood vessel health in preventive medicine are somewhat indirect, using spot check of blood pressure, or labs such as homocysteine levels, CRP, and others.
最常规措施，我们的血管健康，在预防医学有点间接的，以现场检查血压，实验室或如高半胱氨酸水平，社论等。
Daily check the maintenance and operation record of equipment in accordance with SOP or Preventive Maintenance Schedule.
根据操作规程进行设备系统的日常巡检工作并保存记录。
The College also provided a sponsorship of $ 100 for each United College staff who pre-registered for this service on first-come-first-served basis as an incentive for the preventive health check-up.
为鼓励同事积极参与，书院更以先到先得的方式赞助港币一百元予联合书院同事。
Expounds in detail the safety check before the operation, the management and maintenance in operation and the sterilization; preventive maintenance after operation for breathing machines.
对呼吸机使用前的安全性检查，使用过程中的管理和维护，使用后的消毒和预防性维护进行了较全面的叙述。
Analysis on data of preventive physical check-up of practitioners in public health in Beijing Shunyi district
北京市顺义区2008年公共卫生从业人员健康体检结果分析
Abstract: Aimed at the causes of wood degradation, this article puts forward some preventive measures against wood degradation and several aam storage methods in combination with the actual conditions of forestry check stations.
本文针对木材降等变质原因，结合林业检查站实际条件，提出了防止木材降等变质措施及保管方法。
The check and the preventive of weaving flaws
浅论织疵的检查和预防
According to the actuality of sink pole growth, excessive small faultage influencing coal quality in coal fields, through applying the quality preventive measures of design, excavation, transportation, and check out, effectively promote the coal product quality.
根据煤田陷落柱发育、小断层多、煤层变薄，影响煤质的现实，实施了从设计、采掘、运输、装车、检验全过程的质量保证措施，有效地提高了煤炭产品的质量。