[单选题]驼峰的道岔区坡其坡度一般为()。A . 5%~8%B . 5‰~8‰C . 1%~3.5%D . 1‰~3.5‰
[名词解释] 打靶区shot area
[名词解释] 交织区(Weaving area)
[问答题] 简述货区 freight area。
[名词解释] 保护区(Protected area)
[名词解释] 控制区(Controlled area)
[单选题]LAI(Location Area Identification--位置区)是由什么组成的()A.MCCB.MNCC.LACD.CI
[名词解释] 胸腺依赖区(thymus dependent area)
[名词解释] 低度流行区(Area of low pest prevalence)
[名词解释] Switching交换