项目的间接效益和间接费用通常要考察的内容包括（）。
A．环境影响
B．技术扩散效果
C．乘数效果
D．价格影响
E．技术因素
参考答案：A, B, C, D
—We don't know ______.
—It is said that he was born in America. [ ]
A. what is he
B. if he lives here
C. where he comes from
D. which country is he from
基准水泥有效储存期为（）。
A.半年
B.三个月
C.一年
D.到不满足基准水泥要求为止
