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冬季建筑工地上,为了保证施工质量,常在浇筑混凝土时加入盐类,其主要作用是
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在室温下,有两只烧杯,其中①号杯盛有1kgH2O(l)溶解0.01mol蔗糖的溶液,②号杯中盛有1kgH2O(l)溶解0.01mol食盐的溶液,将两只烧杯按同样的速度冷却降温,则
含有非挥发性溶质B的水溶液,在101.325Pa下,270.15K时开始析出冰,已知水的Kf =1.86K×kg×mol-1,Kb=0.52K×kg×mol-1,该溶液的正常沸点是:
一个工作薄包含多个工作表，默认状态下有( )个工作表，分别为Sheet1、Sheet2、Sheet3。
Directions: In this section, there are six sentences. You’re required to read the sentences carefully and match the word in bold in each sentence with given similar words below. Please write down the exact word or phrase.We often think of drawing as something as that takes inborn talent.Professor D. B. Dowd argues that we have misfiled the significance of drawing because we see it as a professional skill instead of a personal capacity.Some believe that doodling during a boring lecture can help students pay attention.Both absent-minded doodling and copying from life have been shown to positively affect your memory and visual perception,so complain loudly the next time your school board slashes the art department’s budget.Researchers, teachers, and artists are starting to see how drawing can positively impact a wide variety of skills and disciplines.They can help to alleviate traffic jams.1. affect ___________________2.improve concentration____________3. cut_______________4. ease_________________5. misclassify______________6. gift___________________
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