因为甲数是乙数的1-15=45,
所以乙数:甲数=5:4,
故选:B.
—Excuse me, do you know _________?
—Sorry, I'm new here. Why don't you ask the man over there?
A. where the bookshop is
B. where can I find the bookshop
C.where is the bookshop
Wanger-Nelson法(简称W—N法)是一个非常有名的方法,它主要是用来计算下列哪一个模型参数( )
A.吸收速度常数Ka
B.达峰时间
C.达峰浓度
D.分布容积
E.总清除率