【单选题】【消耗次数：1】
ΔU=ΔW+ΔQ这个公式反映的是（）
①
热力学第一定律
②
热力学第二定律
③
热力学第三定律
④
热力学第零定律
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相关题目
【单选题】
热力学第一定律表明：（）
①
系统对外做的功不可能大于系统从外界吸收的热量
②
系统内能的增量等于系统从外界吸收的热量
③
不可能存在这样的循环过程，在此循环过程中，外界对系统做的功不等于系统传给外界的热量.
④
热机的效率不可能等于
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