1-环丙基-6-氟-1,4-二氢-4-氧代-7-(1-哌嗪基)-3-喹啉羧酸().
A.诺氟沙星
B.环丙沙星
C.氧氟沙星
D.甲氧苄啶
E.氟康唑
参考答案:B
对比增强磁共振血管造影所采用的序列()
A.极短TR,长TE
B.长TR,极短TE
C.长TR,长TE
D.极短TR,极短TE
E.极长TR,极长TE
Quzhou is a beautiful city. Every year there are __________ tourists.
A.thousands
B.thousands of
C.thousand
D.thousand of