单项选择题 What did the American government do in the year 2009? A. It allowed the Native Americans to vote as a citizen. B. It apologized to all Native Peoples for the many instances of violence, maltreatment, and neglect it has done to them. C. It passed laws to stop the discrimination on the Native Americans. D. It announced that all men are created equal.

单项选择题 经济订货批量模型中考虑的主要因素有？ （1）一次订货成本 （2）存货持有成本 （3）物料采购成本 （4）物料运输成本 A、（1）（2）（3） B、（2）（3）（4） C、（1）（2）（4） D、（1）（3）（4）

单项选择题