热量、内能、热量的计算、内能的改变、内能的利用,是热和能知识板块的热点内容,下面我们就一起梳理这些知识点的考查形式.一、内能的概念例1(2013年四川雅安)下列说法中,正确的是()(A)机械能为零的物体,内能一定也为零(B)炽热的铁水具有内能,冰冷的铁块不具有内能(C)铁丝被快速弯折的过程中,温度升高是因为机械能转化成内能(D)汽油机的压缩冲程中,主要是用热传递的方式增加了气缸内物质的内能 The calculation of heat, internal energy and heat, the change of internal energy and the utilization of internal energy are the hot topics in the heat and energy knowledge section, and we will examine the examination forms of these knowledge points together. 2013, Ya’an, Sichuan) In the following statements, the correct answer is: (A) An object with zero mechanical energy must have zero inner energy. (B) Hot iron has internal energy and cold iron does not have internal energy (C) Iron wire is rapidly bent in the process, the temperature increase is due to mechanical energy into internal energy (D) Gasoline compression stroke, mainly by means of heat transfer to increase the internal cylinder material