被认为是梅毒螺旋体权威的诊断方法是()
A.性病研究实验室试验
B.荧光螺旋体抗体吸收试验
C.快速血清反应素环状卡片试验
D.不加热血清反应素试验
参考答案:B
She is a wellknown doctor now, but she ________ as a cleaner at the hospital for five years.
A.has worked
B.worked
C.had worked
D.works
可翻转肾上腺素升压作用的药物是()
A.M受体阻断剂
B.N受体阻断剂
C.β受体阻断剂
D.α受体阻断剂
E.H1受体阻断剂