水泥比表面积是衡量水泥强度的一个重要指标。

The specific surface area is an important index in measuring the strength of cement.

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挺度：挺度是衡量纸和纸板耐弯曲的强度性能。

Stiffness: It is a measure of the bending strength of paper and board.

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挺度：挺度是衡量纸和纸板耐弯曲的强度性能。

Stiffness: It is a measure of the bending strength of paper and board.

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