所谓热机就是利用热量做功的机器。( )
A.Heat engines are machines used heat energy to do work. B.Heat engines are machines that use heat energy to do work. C.Heat engines are machines how to use heat energy to do work.正确答案B
所谓热机就是利用热量做功的机器。( )
A.Heat engines are machines used heat energy to do work. B.Heat engines are machines that use heat energy to do work. C.Heat engines are machines how to use heat energy to do work.正确答案B
