低度流行区(Area of low pest prevalence)
[名词解释] 非疫区(Pest free area)
[名词解释] 打靶区shot area
[名词解释] 交织区(Weaving area)
[名词解释] contraceptive prevalence
[名词解释] prevalence rate
[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)