搜索 - 科创

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竞选州长［美］马克．吐温　　　几个月之前，我被提名为纽约州州长候选人，代表独立党与斯坦华脱•勒•伍福特先生和约翰•特•霍夫曼先生竞选。我总觉得自己有超过这两位先生的显著的优点，那就是我的名声好。从报上...

先送一个小计算程序，可以较快的计算圆孔燃烧孔常规装药的发动机燃通比，省去半分钟的计算时间。。。因为中考考好了，父母给我干到衡水某中念书了，一个月放40小时的极端压榨下相当...

摘要本文以Beta分子筛为例，通过对Beta分子筛五种多形体（polymorph）结构描述和区别说明，介绍五十年来，从Beta分子筛的首次合成、结构解析到最后一种多形体的发现，结合Be...

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