热机效率公式机械效率=W有用除以Q总.W有用是啥意思?Q总是啥意思?需要带啥公式?这两个W,Q带啥?他们分别代表啥?

来源:学生作业帮助网 编辑:作业帮 时间:2024/07/15 01:23:14
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