A:t1时,只有正方向反应
B:t2时,反应未到达最大限度
C:t2- t3,反应不再发生
D:t2- t3,各物质的浓度不再发生变化
已知函数y=(m2+2m)xm2-m-1
含维生素____的食物有助于防治夜盲症,含维生素____的食物适合坏血病患者食用.
If you do some more reading, listening and speaking, you can the number of words and your listening and understanding ability.