A:5
B:52
C:3
D:2
长方体有( )个面,其中至少有( )个面是长方形
Last year we p____ a lot of trees around our school. And now they grow well.
对于自变量x和因变量y,当x取值一定时,y的取值带有一定的随机性,x,y之间的这种非确定性关系叫( )
出海打鱼的渔民特别关注的是( )