跨越铁路，导线距轨面最小距离为（）米。
A.5.0
B.5.5
C.6.0
D.6.5
参考答案：C
The more highly developed a society is, ______.
A．the more advanced technology will be
B．the larger the number of people will be
C．the more diminished old people's status will be
D．the lower the overall status of the people will be
硐室内各种设备相互之间，应留出（）以上的通道。
A、0.5
B、0.6
C、0.8
D、0.9
