After the alternation, motivation effects on peasant household are also weakened.
随着这一变更，农户所受的激励也有所削弱。
To quench 20 steel in critical zone under different intensity alternation magnetic field and to observe the microstructure after phase transformation.
对20钢进行不同强度交流磁场下的临界区淬火处理，观察相变后的组织。
Based on technical measurement of a certain fan before and after alternation, energy consuming and noise are compared respectively. The economic and technical analysis is made too.
通过对具体主通风机改造前、后的技术测定，对能耗和噪音进行了比较，并进行了经济和技术分析。
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