混凝土中骨料比较理想的颗粒形状是接近于（），此时骨料表面光滑，表面积小，对混凝土流动性有利。
A. 细长状
B. 薄片状
C. 球形
D. 立方体形
E. 扁平状
查看答案
混凝土的组成材料中，砂石主要起（）作用；水泥浆在凝结硬化前主要起（）作用，在凝结硬化后主要起（）作用。
材料的抗渗等级Pn是指的材料所能承受的最大水压力为nMpa。
A. 对
B. 错
下列哪个是属性选择器？
A. .color
B. [color]
C.
D. color
E.
在HTML5中，（）标签可以用于配置视口属性。
A.
B.
C.
D.
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