7.如图所示是一些透镜的截面图在这些透镜中可以分为两类一类包括a和d它们是凸透镜其结构上的共同特点是中间厚边缘薄另一类包括bc Template




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tomski7.如图所示是一些透镜的截面图在这些透镜中可以分为两类一类包括a和d它们是凸透镜其结构上的共同特点是中间厚边缘薄另一类包括bc coloring