A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160370437043.gif" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160378037803.gif" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160390589058.gif" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160397659765.gif" alt="" border="0" />

A 温度相同、质量相同的同种物质，内能不一定相同 B 物体的动能越大，它的内能就越大 C 晶体在熔解时，保持温度不变，因而内能也不变 D 两个物体相互摩擦，一定使物体的温度升高

A 氧气的摩尔质量和氧分子的体积 B 氧分子的质量和氧分子的体积 C 氧分子的质量和氧气的摩尔质量 D 氧气的密度和氧气的摩尔质量

A 分子力总是对乙分子做正功，分子势能不断减小 B 乙分子总是克服分子力做功，分子势能不断增大 C 先是乙分子克服分子力做功，分子势能增大；然后分子力对乙分子做正功，分子势能减小 D 先是分子力对乙分子做正功，分子势能减小；然后乙分子克服分子力做功，分子势能增大

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160469656965.gif" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160470787078.gif" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160437953795.gif" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20130108160432493249.gif" alt="" border="0" />

A 它们的分子平均动能一定相同 B 它们的内能一定相同 C 它们的密度一定相同 D 它们的压强一定相同

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111151743094309.jpg" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111151762636263.jpg" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111151772307230.jpg" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111151792429242.jpg" alt="" border="0" />

A 体积增大，内能改变 B 体积减小，内能不变 C 压强增大，内能改变 D 压强减小，内能不变