借助专家评分进行物流信息系统评价的方法是（）。
A．层次分析评价法
B．多因素加权平均评价法
C．数据包络分析评价法
D．经济效果评价法
参考答案：B
能使混凝土在负温下硬化，并在规定养护条件下达到预期性能的外加剂是（）
A.防冻剂
B.阻锈剂
C.减水剂
D.缓凝剂
And I want to bring up and introduce to you a woman who has been my partner in this process in the United States Government. She provided invaluable leadership to this effort and has on so many important issues facing our country. The Administrator of the Environmental Protection Agency, Lisa Jackson.
