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【简答题】
某同学在《分子和原子》后，对教材中所示的实验进行了如图所示的改进： （1）在小试管中加入2~3片氢氧化钠固体的作用是 。 （2）滴入2~3滴浓氨水后，在C处可观察到的现象是 。 （3）改进后的装置除操作简单、现象明显、药品用量少、省时等优点外，还有一个显著的优点是 。某同学在实验结束进行废液处理时，将氢氧化钠溶液、石灰水和盐酸倒入同一洁净的烧杯中，当他用手接触烧杯壁时，感觉到烧杯“发热”。这一现象引起了他的注意。为了解这三种物质之间的反应情况，他决定从反应后溶液中溶质的组成入手进行探究。 （4）他对反应后溶液中溶质的组成作出了两种合理的假设。假设①：溶质为NaCl、CaCl 2 假设②：溶质为NaCl、CaCl 2 、NaOH、Ca(OH) 2 请你再补充一种合理的假设。假设③：溶质为 。 （5）如果假设③成立，请你根据下表要求，设计一个实验方案进行验证。 （6）比较三种假设，能说明该同学作出假设1的理由是 。
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参考答案：
举一反三
【单选题】What does "Anglo-Saxons"refer to?
A.
Angles and Saxons from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".
B.
Angles and Saxons were from the Jutland peninsula and they were Germanic groups.
查看完整题目与答案
【单选题】Since historical times, England, where the early inhabitants were Celts, has been conquered three times. It was conquered by_____________. A.the Vikings, the Anglo-Saxons, and the NormansB. the Romans...
A.
the Vikings, the Anglo-Saxons, and the Normans
B.
the Romans, the Anglo-Saxons and the Vikings
C.
the Anglo-Saxons, the Vikings and the Normans
D.
the Romans, the Anglo-Saxons, and the Normans
查看完整题目与答案
【单选题】下列不属于股骨头缺血坏死常见X线表现的是
A.
股骨头密度均匀增高
B.
股骨头限局性疏松、囊变
C.
股骨头不均匀硬化
D.
髋臼增大
E.
关节间隙狭窄
查看完整题目与答案
【单选题】Had I know her name,____
A.
or does she know mine?
B.
and where does she live?
C.
she would be beautiful.
D.
I would have invited her to lunch.
查看完整题目与答案
【单选题】What does "Anglo-Saxons"refer to?盎格鲁撒克逊指的是?
A.
Angles and Saxons from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".They are one ethnic group.
B.
Angles and Saxons were from the Jutland peninsula and they were Germanic groups.
C.
People from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".They are two ethnic groups.
查看完整题目与答案
【单选题】下列不属于椎体缺血性坏死影像学表现的是
A.
一般累及-一个椎体
B.
X线多表现为椎体密度增高
C.
椎体前部塌陷较明显
D.
一般椎体皮质受累不明显
查看完整题目与答案
【单选题】I see Mary ______ day in school. I know her very well.
A.
every the second
B.
every second
C.
the every second
D.
the second
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【单选题】下列不属于坏死表现的是( )
A.
细胞坏死可见凋亡小体形成
B.
镜下可见核固缩、核溶解、核碎裂
C.
可引起炎症反应
D.
细胞质膜崩解，结构自溶
查看完整题目与答案
【简答题】Angles, Saxons and______usually known as Anglo-Saxons are the first Englishmen. Language spoken by them is called______, which is the foundation of English language and literature.
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【单选题】I think I know her. She has _____ hair.
A.
short blonde curly
B.
short curly blonde
C.
blonde short curly
D.
curly blonde short
查看完整题目与答案
相关题目：
【单选题】What does "Anglo-Saxons"refer to?
A.
Angles and Saxons from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".
B.
Angles and Saxons were from the Jutland peninsula and they were Germanic groups.
查看完整题目与答案
【单选题】Since historical times, England, where the early inhabitants were Celts, has been conquered three times. It was conquered by_____________. A.the Vikings, the Anglo-Saxons, and the NormansB. the Romans...
A.
the Vikings, the Anglo-Saxons, and the Normans
B.
the Romans, the Anglo-Saxons and the Vikings
C.
the Anglo-Saxons, the Vikings and the Normans
D.
the Romans, the Anglo-Saxons, and the Normans
查看完整题目与答案
【单选题】下列不属于股骨头缺血坏死常见X线表现的是
A.
股骨头密度均匀增高
B.
股骨头限局性疏松、囊变
C.
股骨头不均匀硬化
D.
髋臼增大
E.
关节间隙狭窄
查看完整题目与答案
【单选题】Had I know her name,____
A.
or does she know mine?
B.
and where does she live?
C.
she would be beautiful.
D.
I would have invited her to lunch.
查看完整题目与答案
【单选题】What does "Anglo-Saxons"refer to?盎格鲁撒克逊指的是?
A.
Angles and Saxons from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".They are one ethnic group.
B.
Angles and Saxons were from the Jutland peninsula and they were Germanic groups.
C.
People from what is now the Danish and German border area, collectively known as the "Anglo-Saxons".They are two ethnic groups.
查看完整题目与答案
【单选题】下列不属于椎体缺血性坏死影像学表现的是
A.
一般累及-一个椎体
B.
X线多表现为椎体密度增高
C.
椎体前部塌陷较明显
D.
一般椎体皮质受累不明显
查看完整题目与答案
【单选题】I see Mary ______ day in school. I know her very well.
A.
every the second
B.
every second
C.
the every second
D.
the second
查看完整题目与答案
【单选题】下列不属于坏死表现的是( )
A.
细胞坏死可见凋亡小体形成
B.
镜下可见核固缩、核溶解、核碎裂
C.
可引起炎症反应
D.
细胞质膜崩解，结构自溶
查看完整题目与答案
【简答题】Angles, Saxons and______usually known as Anglo-Saxons are the first Englishmen. Language spoken by them is called______, which is the foundation of English language and literature.
查看完整题目与答案
【单选题】I think I know her. She has _____ hair.
A.
short blonde curly
B.
short curly blonde
C.
blonde short curly
D.
curly blonde short
查看完整题目与答案
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