【判断题】非自动闭塞的区段通过信号机采用两显示机构,绿,黄
【单选题】If you are going to create a tangent arc between two arcs that cannot intersect, to find the center of the tangent arc you must set your compass to a radius that is:
A.
the existing arc radius minus the tangent arc radius
B.
centered at the tangent point of the new arc and the existing arc
C.
the existing arc radius plus the tangent arc radius
D.
the sum of the two existing arc radii
【判断题】在非自动闭塞区段没有分歧道岔的线路所,通过信号机可以采用只有红色和绿色两种显示的信号机构
【单选题】“亢则害,承乃制”说明了五行之间的什么关系