细菌耐药性的发生机制有()
A.灭活酶与钝化酶的产生
B.靶位改变
C.抗生素渗透障碍
D.细菌代谢状态改变
E.外界环境改变
参考答案:A, B, C, D, E
John, a friend of mine, who got married only last week, spent $3,000 more than he______for the wedding.
A.will plan
B.has planned
C.would plan
D.had planned
咳声短促,咳后有鸡啼样回声者,属于()
A.顿咳
B.白喉
C.肺痨
D.肺痿
E.肺痈