t1/2最长的药物是（）
A.氟桂嗪
B.硝苯地平
C.地尔硫
D.维拉帕米
E.氨氯地平
参考答案：E
I didn't know ______. Can you tell me? [ ]
A. who to speak to
B. who speak to
C. who to speak
D. who spoke
卖方企业在交付货物之前向买方预先收取部分或全部货款的信用形式，称为（）。
A.预收账款
B.应付账款
C.应收账款
D.应付票据
