题目

Most of us spend all day at school work. After a long and busy day, all we want to do is return to a comfortable home. Smart technology can turn any home into a nicer place to live.Smart homes have been around for some time. Scottish company Pico Electronics invented type of technology called X10 in 1975.As the earliest smart home technology, it allows household devices (设备), such as lights and alarms, to communicate with each other by using radio waves.Of course, 5G network connectivity has made smart homes much more sophisticated (复杂) than X10. Perhaps the most widespread smart home 在一定温度下，反应：2A（s)+2B(g) C(g)+D(g)在恒容容器中进行，不能说明该反应已经达到平衡的是A．容器内的压强不随时间而变化B．混合气体的密度不再随时间而变化C．A的质量不再改变D．平衡混合气体的平均相对分子质量不再改变