关节间隙是由哪些结构组成：（）
A.关节软骨
B.关节滑膜
C.关节腔
D.关节骨端
E.骨骺
参考答案：A, C
—It’s hard to believe that Jack ________ have fought with the policeman.
—Yes.If one ________ ask for trouble, it can't be helped.
A．would; will
B．must; may
C．should; must
D．need; dare
说明增值税专用发票代理审查操作要点。
