298K时，在容积不变的密闭容器中注满NO2气体，2NO2（g）⇌N2O4（g）△H＜0．平衡后把该容器置于沸水中，下列性质或数值不会改变的是( )
①颜色 ②平均摩尔质量 ③质量 ④压强 ⑤密度．
| A．①② | B．②③ | C．④⑤ | D．③⑤ |
相关试题
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
If you leave the club, you will not be_____back in .
| A．received | B．admitted | C．turned | D．moved |
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
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