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火星载人探测的主要倡导者Robert Zubrin概述了10年内向火星运送宇航员的费用相对较少的计划。 相似文献
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没有几位科学家认为被技术问题所困扰的伽里略号太空飞行器(木星轨道探测器)能够对木星系统进行范围如此广泛的研究,也没有几个人预测到这些世界的内部结构是如此丰富多彩。 相似文献
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Euro-American 2nd- and 4th-grade children (Ms=7.67 and 9.82 years) heard stories about Black and White characters who produced artwork yielding a windfall reward. Children allocated rewards to characters, justified their allocations, and judged the fairness of patterns representing different justice principles. Older children allocated more money to Black than White productive characters and to White than Black needy characters, consistent with predictions from aversive racism theory. Rationales most often relied on equality principles; older children gave more equity-based justifications for Black than for White characters. Fairness ratings of patterns representing 4 justice principles revealed effects for age and character race. Implications for understanding the developmental course of moral judgments as they apply to racial differences are discussed. 相似文献