题干
On the rescue scene of the copper mine in Chile, the crowd cheered _________ a miner was safely brought to the surface.
A：from time to time
B：any time
C：at a time
D：every time
答案(点此获取答案解析）
D
2NO2(g)；（△H>0）在密闭容器中达到平衡.下列说法不正确的是
