钩端螺旋体的显微镜凝集试验,单份血清标本有诊断意义的滴度是()
A.1:100
B.1:200
C.1:300
D.1:400
E.1:500
参考答案:C
以下哪项不是门静脉高压的主要超声表现()。
A.门静脉系统的血管内径增宽
B.门静脉血流方向为向肝血流
C.门静脉血流速度减慢
D.胃底食管静脉迂曲扩张
E.脐静脉开放
把下面的句子按正确的顺序排列成对话。
A. See you.
B. It's seven o'clock.
C. See you, mum
D. It's time to go to school.
E. Mum, what's the time, please.
正确的顺序: