公共交通的特点包括______。
A．运量大
B．投资大
C．集约化经营
D．占地空间少
E．污染小
参考答案：A,C,D,E
Mr. White is my English teacher. He ______ in this school for about 5 years.
A．has worked
B．will work
C．is working
D．works
简述柔性制造系统的优点？
