《铁路工务安全规则》规定，当允许速度υmax≤160km/h时，作业人员下道避车，距轨头外侧距离应不小于2m。
参考答案：错
氨水物理性质有 ______．
She was with the belief that one must return what one has borrowed.
A．brought about
B．brought back
C．brought up
D．brought out
