英语词汇back work ratio怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	back work ratio
释义	back work ratio 简明释义回功比：指在某个过程中，输出功与输入功的比值。专业释义 1 航空、航天科学技术回功比双语例句 1 In this work, the questionnaire was used for collecting data. Totally 268 questionnaires were sent out while 142 valid ones were got back. The ratio of valid questionnaire is 53%. 本研究采用问卷调查方法进行了数据收集，共发出调查问卷268份，回收有效问卷142份，有效问卷率为53%。
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