It was a hard-swept looking little house with hard-polished Windows, and a clean mud-mat on the front steps.

看得出这座不大的屋子好好打扫过，窗户也曾细心地擦拭过，就连前面台阶上的擦鞋垫都收拾得干干净净。

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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。

youdao

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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