四显示自动闭塞区段通过显示绿黄色灯光的信号机,列车运行限制速度为()。
A、80km/h
B、100km/h
C、120km/h
D、在前方第三架信号机前能停车的速度
参考答案:D
A Spear or a robot has the quality of technology only when it______.
A.is used both as a cultural and a physical object
B.serves different purposes equally well
C.is utilized by man
D.can be of use to both man and animal
牙龈的结合上皮表面是()
A.不全角化
B.正角化
C.混合角化
D.无角化
E.可角化可不角化