单选题：一平面简谐横波的波动表达式为y=0.05Cos(20πt+47πχ)(SI)。取k=0，±l，±2，…，则t=0.5s时

题目内容：

一平面简谐横波的波动表达式为y=0.05Cos(20πt+47πχ)(SI)。取k=0，±l，±2，…，则t=0.5s时各波峰所在处的位置为（　　）。

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