____是指亲子间的相似性;变异是指亲子间和子代个体间的差异.
已知tanθ=43,则sinθ+cosθsinθ-cosθ的值为( )
以点B为位似中心,在网格内画出△A2B2C2,使△A2B2C2与△ABC位似,且位似比为2:1,点C2的坐标是 ____
判断正误。
I like Chinese music. I don't like pop music. Because I think pop music is not quiet. I can play the zither. My sister can play the zither, too . But she's better than me. We can play the erhu. I am better than my sister.