用来代表资金时间价值的利息率中包含着风险因素。 ( )
参考答案：错
I hear they've promoted Tom ,but he didn't mention_________ when we talked on the phone. [ ]
A. to promote
B. having been promoted
C. having promoted
D. to be promoted
已知HCl难溶于CCl4．则如下图所示装置中，不适宜于HCl气体尾气吸收的是（ ）
A．
B．
C．
D．
