Adopting special technical treatment on lamps to guarantee UV depreciation less than 25% during the useful lifetime.
采用特有的处理技术，确保灯管在有效寿命期间的紫外线衰减小于25%。
The paper states the depreciation problems of domestic construction machinery and points out that low depreciation factor will result in decreament of technical equipage level of machines.
本文陈述了国内工程机械折旧问题的现状；指出，折旧率低下将导致机械技术装备水平下降；
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