—____ are these tomatoes?
—They're green.
A:What
B:How many
C:What color
用计算器比较大小:3+2____π.(填“>”,“<”或“=”号)
在平面直角坐标系中,我们定义点P(a,b)的“变换点”为Q.且规定:当a≥b时,Q为(b,﹣a);当a<b时,Q为(a,﹣b).