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本文认为如果已有直流电源可以利用,直流提升拖动无疑比交流提升拖动便宜,……假如沒有直流电源可以利用时,在确定最終方案之前,应当很仔細地研究所有交流和直流的方案。
This paper argues that if DC power is already available, DC boosting is undoubtedly cheaper than AC boosting ... If no DC power is available, all AC and DC schemes should be studied very carefully before finalizing the scheme.