温度、压强相同的氦气和氧气,它们分子的平均动能<img src="/lqwvjeImg/73/73e69ac6630c901b0b11d5106304b4d1.png"style="width:15px;height:16px;">和平均平动动能<img src="/lqwvjeImg/ba/ba3a90838b4791395eccd8efdfe0e88d.png"style="width:16px;height:16px;">有如下关系:( )<br>· <img src="/lqwvjeImg/73/73e69ac6630c901b0b11d5106304b4d1.png"style="width:15px;height:16px;">和<img src="/lqwvjeImg/ba/ba3a90838b4791395eccd8efdfe0e88d.png"style="width:16px;height:16px;">都相等<br>· <img src="/lqwvjeImg/73/73e69ac6630c901b0b11d5106304b4d1.png"style="width:15px;height:16px;">相等,而<img src="/lqwvjeImg/ba/ba3a90838b4791395eccd8efdfe0e88d.png"style="width:16px;height:16px;">不相等<br>· <img src="/lqwvjeImg/ba/ba3a90838b4791395eccd8efdfe0e88d.png"style="width:16px;height:16px;">相等,而<img src="/lqwvjeImg/73/73e69ac6630c901b0b11d5106304b4d1.png"style="width:15px;height:16px;">不相等<br>· <img src="/lqwvjeImg/73/73e69ac6630c901b0b11d5106304b4d1.png"style="width:15px;height:16px;">和<img src="/lqwvjeImg/ba/ba3a90838b4791395eccd8efdfe0e88d.png"style="width:16px;height:16px;">都不相等