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【简答题】
(4分)某兴趣小组用下图所示装置收集并测量反应产生的气体及其体积。 试填空。 (1)该发生装置可以制备初中化学常见的 气体(填写化学式)。 (2)图示装置对反应物的状态和反应条件的要求是: 、 。 (3)利用该装置测得反应生成气体体积偏大的最主要原因是: 。
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【单选题】采用乙醇沉淀法除去水提取液中多糖等杂质,应使乙醇浓度达到
A.
50%以上
B.
60%以上
C.
70%以上
D.
80%以上
E.
90%以上
【判断题】模拟式测量是小量程内可实现高精度测量。
A.
正确
B.
错误
【单选题】采用乙醇沉淀法除去水提取液中多糖等杂质,应使乙醇浓度达到( )
A.
50% 以上
B.
60%以上
C.
70%以上
D.
80%以上
【单选题】Which of the following statements is CORRECT?
A.
Drastic changes in the weather have been common since ancient times.
B.
The change in weather from very cold to very hot lasted over a century.
C.
The scientists have been studying ice to forecast the weather in the future.
D.
The past 10,000 years have seen minor changes in the weather.
【单选题】濒死阶段病人相对较晚消失的感觉是
A.
视觉
B.
听觉
C.
嗅觉
D.
触觉
【单选题】When Lovecraft was born?
A.
August 21 1980
B.
August 20 1890
C.
August 20 1891
D.
August 21 1890
【简答题】建造一幢房屋,是一个复杂的工程,需要经过( )和( )两个阶段。
【单选题】Which of the following statement is CORRECT?
A.
Drastic changes in the weather have been common since ancient times.
B.
The change in weather from very cold to very hot lasted over a century.
C.
The scientists have been studying ice to forecast weather in the future.
D.
The past 10,000 years have seen minor changes in the weather.
【简答题】The drastic changes in the international situation___________________(把建立国际新秩序的问题进一步提到了全世界面前).
【单选题】濒死阶段病人相对较晚消失的感觉是( )
A.
视觉
B.
听觉
C.
嗅觉
D.
味觉
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