The dead rate is _____ pigs and recovery usually ______ within 7-10 days.
A low in; occurs B. rich in;happens
C. high in; came about D. poor in;took place
相关知识点
推荐套卷
The dead rate is _____ pigs and recovery usually ______ within 7-10 days.
A low in; occurs B. rich in;happens
C. high in; came about D. poor in;took place