It should be provided with science significance and practice worthiness that to carry out study on the desertification cause, process, endanger, trend and control.
开展沙漠化的研究，探讨其成因、过程、危害和发展趋势，为防治提供理论依据，是有很好的科学意义和实践价值的。
By study the influence of transport distance and pig pre-slaughter rest on the ponderance and probability of PSE pork, try to find out the main cause and effective control means of PSE pork.
通过研究运输距离和宰前静养对PSE猪肉产生几率及严重度的影响，找出产生PSE猪肉的主要原因以及有效控制措施。
Objective To study the harm, cause and regularity of fire, and to provide some tactics for prevention and control.
目的了解火灾及其伤害的危害程度、流行原因及其规律，为制定火灾伤害的防制对策提供依据。
This will cause multicast service deployed more difficulty on Metro-E network. In this paper, I analyze and study IP multicast control technology on L2 Metro-E network.
在本文中，笔者首先对已有IP组播控制技术分析，针对城域以太网的二层网络对IP组播控制技术进行研究。
This will cause multicast service deployed more difficulty on Metro-E network. In this paper, I analyze and study IP multicast control technology on L2 Metro-E network.
在本文中，笔者首先对已有IP组播控制技术分析，针对城域以太网的二层网络对IP组播控制技术进行研究。
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