防爬设备安装有何要求?
参考答案:
防爬设备应安装在钢轨中部,接头附近2根轨枕不宜安装。防爬支撑宜安装在钢轨底下,也可安装在与轨底边净距不小于350mm的道心内。
From that moment on, I have come to realize that I'm unique in the eyes of my parents and that
they'll _____ me in face of misfortunes and hardships. [ ]
A. devote to
B. refer to
C. stick with
D. deal with
脊髓亚急性联合变性主要是由于()
A.脊髓血液循环异常引起
B.免疫损伤所致
C.维生素B12缺乏所致
D.维生素B6缺乏所致
E.维生素B1缺乏所致