A:=0.3mol/(L·s) (2)ひ
B:=0.6mol/(L·s)(3)ひ
C:='0.4mol/(L·s)' (4)ひ
D:=0.45mol/(L·s),则该反应速率的快慢顺序为()
若变量x,y满足约束条件{x+y-3≤0x-y+1≥0y≥1,则z=2x-y的最大值为( )
一 Have you finished the poster for the party?
一 Not yet. I it in two days.
小丽同学站在竖直放置的平面镜前1m处,当她远离平面镜时,她的像( )