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【简答题】
实验室用氯化钠固体配制1.00mol/L的NaCl溶液0.5L,回答下列问题 (1)请写出该实验的实验步骤 ①________,②________,③_________,④_________,⑤________。 (2)所需仪器有:容量瓶(规格:________)、托盘天平。欲完成该实验还需要哪些实验仪器_________________________________。 (3)试分析下列操作对所配溶液的浓度有何影响及造成该影响的原因。 ①为加速固体溶解,可稍微加热并不断搅拌。在未降至室温时,立即将溶液转移至溶量瓶。对所配溶液浓度的影响:__________________,原因是:_________________________。 ②后,加盖倒转摇匀后,发现液面低于刻度线,又滴加蒸馏水至刻度。对所配溶液浓度的影响__________________,原因是:____________________________。
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【判断题】3位二进制译码器应有3个输入端和8个输出端
A.
正确
B.
错误
【简答题】Read the following passage carefully. Then answer the questions or complete the statements in the fewest possible words. The library is one of the most popular places at a Western university. Students...
【简答题】Directions: Read the passage carefully and answer the questions or complete the statements in the fewest possible words. We’d like to agree with the recent report comparing the difference between a TV...
【简答题】阅读理解。 Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words. When the Internet powerhouse Yahoo wanted to teach ethics (道德标准) to its employees, ...
【单选题】The figure given above depicts the IS-LM-FE model with floating exchange rates. In Figure 24.1, the shift of the FE curve from FE0 to FE1 was caused by:
A.
acontractionary monetary policy.
B.
official intervention in the foreign exchange market.
C.
an improvement in current account position.
D.
an appreciation of the country's currency.
【简答题】Read the following passage carefully. Then answer the questions or complete the statements in the fewest possible words. Caring for animals, tutoring kids, helping seniors: Volunteer hours are more th...
【多选题】有关灰色预测的说法正确的有()。
A.
是一种对含有不确定因素的系统进行预测的方法
B.
建立模型之前,需先对原始时间序列进行数据处理
C.
常用的数据处理方式有累加和累减两种
D.
建立模型之前,不需先对原始时间序列进行数据处理
E.
经过数据处理后的时间序列称为生成列
【简答题】阅读理解。 Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words. Culture shock is so named because of the effect it has on people when they enter a ...
【多选题】有关灰色预测的说法正确的是()
A.
是一种对含有不确定因素的系统进行预测的方法
B.
建立模型之前,需先对原始时间序列进行数据处理
C.
常用的数据处理方式有累加和累减两种
D.
建立模型之前,不需先对原始时间序列进行数据处理
E.
经过数据处理后的时间序列称为生成列
【简答题】试分析《聊斋志异 小翠》中的小翠形象。
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