【单选题】【消耗次数：1】
扫描图像时，输入分辨率常dpi来表示，它是指__________。
①
每英寸的像素数
②
每英寸的位数
③
每厘米的点数
④
每英寸的颜色数
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下列关于dpi的叙述（ ）是正确的。（1）每英寸的bit数（2）每英寸像素点（3）dpi越高图像质量越低（4）描述分辨率的单位
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