变质岩结构之一是()
A.隐晶质结构
B.玻璃质结构
C.斑状结构
D.变晶结构
参考答案:D
---May I try the shoes on?
---______, but I think they will be too small for you.
A.As you like
B.It is a pleasure
C.By all means
D.Believe it or not
下面哪种是普通螺纹的特征代号()。
A.M
B.Tr
C.Rc
D.Rp