阻断α1、α2和β1受体的药物是
A.拉贝洛尔B.普萘洛尔C.哌唑嗪D.酚妥拉明E.美托洛尔
参考答案:A
The driver began to speed up to () for the hour had lost in the traffic jam.
A. keep up
B. take up
C. catch up
D. make up
在确定石油产品残碳结果时,必须注意瓷坩埚里面的残留物情况,它应该是(),否则重新测定。