The low grade of concrete and negative moment reinforcement descending cause the appearance of concrete crack in a workshop floor.
某工业厂房现浇混凝土楼面由于混凝土抗压强度偏低和负弯距钢筋下移，造成了抗弯承载力不足，出现了大量裂缝。
The cells of the product were dense, the outward appearance of the product was fine, and the density was low, coming up or approaching to those of import product of the same grade.
所制产品泡孔致密，外观良好，密度较低，基本达到或接近国外同类产品水平。
The appearance of staurolite indicates that the metamorphism has reached the low amphibolite grade.
十字石的出现表明变质作用已达到低角闪岩相。
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