以下哪位学者首先报道使用了机械性矫治器()
A.Angle
B.Ifunter
C.Fauchard
D.Celsus
E.Hippocrates
参考答案:C
______ in Shanghai for more than ten years, he know the city very well.
A.Living
B.Having lived
C.Lived
D.Having been lived
货币制度主要包括哪些基本内容