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30楼#
发布于：2015-06-09 21:40
理科生。哼哼。
阻力大于动力，减速运动至停止。不停也可以~ 百度了一下，中国民族工业在1936——1949年遭受沉重打击并萎缩.. 不明觉厉。 但答案是B妥妥的。 |
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31楼#
发布于：2015-06-09 21:29
什么鬼？？
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