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【单选题】
我国人口老龄化形势严峻，子女赡养负担加重，为适应人口发展新形势，党中央对计划生育政策进行重大调整完善，启动实施“单独两孩”政策。计划生育政策进行调整完善体现的哲理是（） ①价值判断和价值选择往往会因人而异 ②完善上层建筑以更好地服务于经济基础 ③社会意识根源于社会存在并促进其发展 ④价值判断和价值选择具有社会历史性A.
①②
B.
②③
C.
①③
D.
②④
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【简答题】根据所给的首字母填写单词。 There are some very good things about open education. This way of teaching a l the students to develop their interests in many subjects. Open education asks students to be responsible(负...
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【简答题】This way for _______________(持票人).
【单选题】流体在管道内的流动分层流和湍流两种状态,其中雷诺数 Re ()为旺盛湍流。
A.
＜ 2300
B.
＞ 10 4
C.
=4200
D.
2300 ＜ Re ＜ 10 4
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