Separation and determination of alkane and cycloparaffinic hydrocarbon in heavy oil by combining ultrasonic wave with the adductions of urea and thiourea是什麼意思_Separation and determination of alkane and cycloparaffinic hydrocarbon in heavy oil by combining ultrasonic wave with the adductions of urea and thiourea在線翻譯_英語_讀音_用法_例句