ac variable frequency regulating speed
ac variable frequency regulating speed
交流变频调速
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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And the introduction of ac Variable Frequency Speed Regulating technology in the petroleum domain has become a effective action to conserve energy and improve the product quality.
而在石油领域中引入交流变频调速技术已成为节能以及提高产品质量的有效措施。
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