下列选项中,()不属于构件运输与安装所指的小型构件。
A.垃圾道
B.压顶
C.踏步
D.预应力空心板
参考答案:D
—When and where to spend the holiday ____ yet.
—Let’s make it now.
A.is decided
B.doesn’t decide
C.has not been decided
D.has decided
墙、柱的计算高度与其相应厚度的比值,称为()。
A.高宽比
B.长宽比
C.高厚比
D.高长比