短焦距镜头又称（）
A、广角镜头
B、望远镜头
C、标准镜头
D、微距镜头
参考答案：A
Not until recently _______ paid work outside the home.
A．most mothers in Britain took
B．did most mothers in Britain take
C．took most mothers in Britain
D．were most mothers in Britain taken
吊钩门式起重机的类、组、型代号为（）。
A.MD
B.MG
