... modulus of elliptic integral ==> 椭圆积分的模 modulus of fineness ==> 细度模数 modulus of flexibility ==> 挠性模数 ...
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fineness modulus of sand 细度模数
Such as sand not clean (mud high content), sand the fineness modulus too high or too low, also can make the strength of concrete is reduced, and the water increased.
如砂石不干净(泥含量较大)、砂的细度模数过高或过低等，也会使混凝土强度降低、泌水性增加。
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