奶牛场有5个牛棚,每个牛棚里有12头奶牛,一天喂1200千克饲料,平均每头奶牛喂多少饲料?
1200÷5÷12,
=240÷12,
=20(千克).
答:平均每头奶牛喂20千克饲料.
某猪场病死猪剖检见心脏扩张,心室和 * * 肌有大小不等、界限不清的淡灰或,白色的条纹,状似虎斑,部分病死猪在蹄冠与趾间出现水泡与烂斑。根据上述病理学特征,该病可初步诊断为()
A.猪瘟
B.猪丹毒
C.口蹄疫
D.副伤寒
E.猪水泡病
This is my twin sister, Lucy. Not only she but also I _____ good at drawing. [ ]
A. is
B. am
C. are