... energy absorption 能量吸收 energy alternation 能量交换 energy balance 能量平衡 ...
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... 能量耗散原理：principle of energy dissipation 能量更迭：energy alternation 能见距离：visual range ...
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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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