氨苄西林属于()
A.耐青霉素酶
B.耐酸青霉素且可口服
C.广谱青霉素类,但对铜绿假单胞菌无效
D.广谱青霉素类,对铜绿假单胞菌有效
E.天然青霉素
参考答案:C
It seems that the aged people _________ the H7N9 more easily from the recent cases. [ ]
A. pick up
B. mix up
C. set up
D. use up
要求其它建筑物与畜舍之间保持一定的距离,一般不应小于屋脊高度的2倍。