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【简答题】
某学校化学兴趣小组的同学为了测定石灰石中碳酸钙的质量分数，称取了4份石灰石样品（设该石灰石中不含其他碳酸盐），分别加入过量的稀盐酸进行实验，结果如下： 分析上述实验数据并回答： （1）哪次实验数据有明显错误？为什么？ （2）计算这种石灰石样品中碳酸钙的质量分数．
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【单选题】The English language ()a vivid saying to describe this sort of situation.
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owns
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contains
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holds
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possesses
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相关题目：
【单选题】Cansumers are not supposed to throw used computers in the trash because ______
A.
they contain large amounts of harmful substances
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this is banned by the California government
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some parts may be recycled for use elsewhere
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B.
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discovered without physical contact
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discovered only through frequent meetings
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【单选题】All of the following statements about the tails of comets are true EXCEPT:
A.
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B.
They can be formed only when there is sufficient heat.
C.
They are formed before the coma expands.
D.
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查看完整题目与答案
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【简答题】翻译《中国古代诗歌散文欣赏》中文言文的重要句子。 1 .信造化之尤物也。 2 .但祠宇极于荒残,若稍饰以楼观亭榭,与江山相发挥,自当高出金山之上矣。 3 .方今之时,臣以神遇而不以目视,官知止而神欲行。 4 .依乎天理,批大郤,导大窾,因其固然,技经肯綮之未尝,而况大軱乎! 5 .彼节者有间,而刀刃者无厚;以无厚入有间,恢恢乎其于游刃必有余地矣,是以十九年而刀刃若新发于硎。 6 .虽然,每至于族,...
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A.
owns
B.
contains
C.
holds
D.
possesses
查看完整题目与答案