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【判断题】
科学活动中,为了客观公正地观察和分析事实材料,避免“带着有色眼镜看问题”,应当排除头脑中已有的理论认识的指导,使人们在观察中对一切已有的理论持“中立态度”。A.
正确
B.
错误
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举一反三
【简答题】66666666666
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored in a cold place.
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored, in a cold place.
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored in a cold place.
【简答题】A．They are difficult to read. B．They are slowly falling apart. C．They were not made from wood pulp. D．They should be stored in a cold place.
【单选题】下列基团从小到大排列正确的是
A.
烷基、醚基、酯基、酮基
B.
烷基、酯基、醚基、酮基
C.
烷基、酮基、醚基、酯基
D.
烷基、酯基、醚基、烯基
E.
烷基、酮基、酯基、醚基
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