A:②⑤⑥
B:③④⑥
C:①④⑥
D:①③⑤
地球自转的周期是一个恒星日,即24小时.(判断对错)
The company won the bid for the project by saying that it would do the cleaning up afterwards ________.
H2(g)+S(s)⇌H2S(g),K1;
S(s)+O2(g)⇌SO2(g),K2.
则反应:H2(g)+SO2(g)⇌O2(g)+H2S(g)的平衡常数为( )