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( 书 p.68 第四题 ) 根据如图所示平面点阵结构图形回答问题: (1) 请将平面点阵结构抽象出相应的平面点阵; (2) 画出正当点阵单位; (3) 指出其点阵型式; (4) 指出每个结构基元包括几个 ○ 和几个 ● ; (5) 用分数坐标表示出正当点阵单位中所有球的位置。
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