( )不是城市道路系统规划的依据。
A．城市交通规划
B．城市现状道路交通问题分析
C．城市用地布局规划方案
D．城市交通发展战略
参考答案：D
It's not easy to learn English well. ________as much as possible is necessary. [ ]
A. Having read
B. Read
C. Reading
D. To have read
货车用的手制动机主要有（）、螺丝闸、盒子闸。
