Eva is a method of evaluating the business achievements in western countries, REVA and MVA are its rectification and improvement. But they still have some flaws and limits.
EVA是西方近年来兴起的一种经营业绩评价方法，REVA、MVA则是对EVA的修正和完善，但也存在不足与局限。
The issues of commonly used simple controllable rectification circuit and waveform were analyzed, and the improvement necessity was put forward.
从分析常用的简单可控整流电路和波形存在一定问题入手，提出改进的必要性。
The drastic off - schedule of San Francisco's vintage cable cars and their improvement tendency after certain rectification measures having been taken recently are reported.
介绍旧金山缆车近几年来的严重误点情况，以及最近采取一些整顿措施后的改善趋势。
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