Mom promised to buy me a nice gift for my birthday, ________ beyond my imagination.
A:the one
B:that
C:which
D:something
固体单质A和气体单质B在容积一定的密闭容器中完全反应生成气体C,相同温度下测得容器内压强不变,若产物气体C的密度是原气体密度的4倍,则判断正确的是( )