同时具有α和β受体阻断作用的药物是()
A.妥拉唑林
B.酚妥拉明
C.拉贝洛尔
D.普萘洛尔
E.哌唑嗪
参考答案:C
食管支架一般最高不能靠近环状软骨几厘米处?()
A.2cm
B.3cm
C.4cm
D.5cm
E.以上都不对
The new librarian still doesn't know()the out of date newspapers and magazines.
A.what to deal with
B.how to deal with
C.how to do with
D.what to do away with