空心桥墩按壁厚分为厚壁和薄壁两种,划分的界线是厚度与中面直径的比值等于( )。
A.1/10
B.1/8
C.1/12
D.1/6
参考答案:A
I wish I ____ there to witness the wedding ceremony of Prince William and Kate last month.[ ]
A. be
B. were
C. had been
D. was
在Lightscape模板中,UserDefind的意思是()。
A、用户自定义
B、用户自定义金属
C、布料
D、漫反射