首先,我们需要明确"二寸照片"是指一种尺寸为2英寸×2英寸(2*2 inch)
滤网孔径对应目数一览表 目(mesh)是指 1inch(2.
1英寸=2.54cm.
measurements inches centimeters 中商海外直订 gra.
foot 英尺 1 foot = 12 inches inch 英寸 1 inch = 2.
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