函数的图象可以看成是的图象上所有点的横坐标缩到原来的倍而得到

函数的图象可以看成是的图象上所有点的横坐标缩到原来的倍而得到的(纵坐标不变),则                                                

A.           B.          C.          D

答案

B

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