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You can get the DS-2019 from _____（）
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What kind of elements of the audience are essential in affecting an oral presentation’s organization and content（）
The following methods can serve as support when you write a paragraph except for ______（）
有NH4NO2分解得氮气和水，在23℃，95549.5Pa条件下，用排水集气法收集到57.5 cm3氮气。已知水的饱和蒸汽压为2813.1Pa，则干燥后氮气的体积为（）
In order to make your point clear as soon as possible, we’d better put the topic sentence ______ the paragraph（）
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