下列现象中哪一个是通过做功使物体内能增加的     A.两手相互摩

下列现象中哪一个是通过做功使物体内能增加的    

A.两手相互摩擦,手的温度升高    

B.用煤气炉给水加热

C.用热水袋取暖         

D.冬天站在太阳下的人会觉得暖和

答案

A

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