厚度号数：美国量度一寸内有多少张纸的方法。是在标准压力下一寸厚的纸张页数。
Bulking number: American paper measurement of the number of sheets that bulk to 1 inch in thickness under standard pressure.
厚度号数：美国量度一寸内有多少张纸的方法。是在标准压力下一寸厚的纸张页数。
Bulking number: American paper measurement of the number of sheets that bulk to 1 inch in thickness under standard pressure.
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