由于操作者的心理因素和习惯使然致使绘制出的质量分布直方图极可能是（）。
A.标准型直方图
B.双峰型直方图
C.孤岛型直方图
D.偏峰型直方图
参考答案：D
筒压法检测砖砌体中砌筑砂浆强度，水泥砂浆中所用砂的品种有（）
A.粗砂
B.中砂
C.细砂
D.特细砂
A square countertop has a square tile inlay in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39, which of the following could be the width, in inches, of tile strip Ⅰ.1 Ⅱ.3 Ⅲ.4
A．Ⅰ only
B．Ⅱ only
C．Ⅰ and Ⅱ only
D．Ⅰ and Ⅲ only
E．(E) Ⅰ, Ⅱ, and Ⅲ
