A:y= 3x
B:y= x3
C:y= 12x
D:xy= 12
已知集合A={1,2,3},B={x|x2<9},则A∩B=( )
—Must we leave the classroom now?
— No, you _____. You _____ leave after the bell rings.
下列四个装置都能制取二氧化碳,其中能随时控制反应的发生和停止的是( )