在标准状态下，体积相同的氦气和氢气，它们分子的平均动能<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />和平均平动动能<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />1的关系为（）。<br>A:<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />和<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />1都相等<br>B:<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />相等而<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />1不相等<br>C:<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />1相等<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />而不相等<br>D:<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />和<img src="/Image1/62/628e1d0cdfb2436d725bd57b4c8f8d2b.png" />1都不相等