下列属于三类动物疫病的病种是？（）
A、狂犬病
B、猪传染性胃肠炎
C、猪副伤寒
D、猪密螺旋体痢疾
参考答案：B, C, D
Before writing a book, the first thing is considering what to say.()
A. you must first ponder what to say and what not to be said carefully
B. it’s extremely necessary that you know what to say
C. the first thing is to consider what to say
D. you must first ponder what to say and what not to say
高压设备上工作分哪三类？
