防止钢轨磨耗的措施有哪些?
参考答案:
(1)加强综合养护维修。
(2)合理设置曲线超高;
(3)调整轨底坡;
(4)定期在钢轨上涂油。
(5)调换曲线内外轨钢轨,延长钢轨使用寿命。
He got very angry but many of us thought there was no reason . [ ]
A. to be
B. to being
C. being
不是噪声传播途径的控制措施的是()。
A.吸声
B.控制人为噪声
C.隔声
D.消声