Methods Data of benefit and cost on 7 color ultrasonic devices in using are collected and analyzed by using Benefit Cost Ratio (BCR) method.是什么意思_Methods Data of benefit and cost on 7 color ultrasonic devices in using are collected and analyzed by using Benefit Cost Ratio (BCR) method.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句