下列药物中为阻断α、β受体的降压药是()
A.哌唑嗪
B.拉贝洛尔
C.普萘洛尔
D.硝普钠
E.维拉帕米
参考答案:B
He told me that he had two girl-friends, neither of _______ knew anything about the other.
A.whom
B.them
C.which
D.who
“零库存”是对某个具体企业而言的,是在有充分社会储备保障前提下的一种特殊库存管理形式。