竹脚手架的材料应符合的要求中,( )有效部分的小头直径不得小于9cm。
A.小横杆
B.大横杆
C.立杆
D.剪刀撑
参考答案:A
Mary is by no means learned; nor is she good at any practical trade. The only asset she possesses is her beauty.
A.something valuable
B.temptation
C.something pleasing to the eye
D.womanly virtue
场景由一个命令视图和一个或多个光源组成,如果指定了场景,RENDER将使用场景中的视图和光源信息,.AUTOCAD的图形文件中可建立()场景。
A.无数个
B.不超过20个
C.5个
D.3个