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【单选题】
在关系模式R中,若其函数依赖集中所有决定因素都是候选键,则R最高范式是( )。
A.
2NF
B.
3NF
C.
BCNF
D.
1NF
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【单选题】在配位滴定中常用指示终点的指示剂是 ( )
A.
甲基橙
B.
铬黑 T
C.
淀粉
D.
溴甲酚绿
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【判断题】常用农业投入品可以在淘宝、京东、天猫等公共电商平台网购。（ ）
A.
正确
B.
错误
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【单选题】常用铬黑 T 作指示剂的滴定分析是 ( )
A.
酸碱滴定
B.
沉淀滴定
C.
配位滴定
D.
氧化还原滴定
查看完整题目与答案
【单选题】They have produced _____ steel this year as they did five years ago.
A.
twice many as
B.
twice as many
C.
twice much as
D.
twice as much
查看完整题目与答案
【简答题】In many English homes, people eat four meals a day: breakfast, lunch, tea and dinner. People have breakfast from seven to nine in the morning. They eat porridge (粥) , eggs and bread. They also drink t...
查看完整题目与答案
【判断题】常用农业投入品可以在淘宝、京东、天猫等公共电商平台网购。( )
A.
正确
B.
错误
查看完整题目与答案
【判断题】铬黑T是常用的配位滴定指示剂。
A.
正确
B.
错误
查看完整题目与答案
【简答题】阅读短文,填入所缺单词: I have six silkworms. They are small and white. They have many ______. I put _______ on the leaves. They like _______ the leaves. They grow and grow. They ______ small, but now they are b...
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【简答题】Sam and Ann have three meals a day: breakfast, lunch, 1 dinner. They have breakfast at home. 2 weekdays they have lunch at school. They 3 have quick meals such as hamburgers and hot dogs. 4 on weekend...
查看完整题目与答案
【简答题】Sam and Ann have three meals a day: breakfast, lunch 1 dinner. They have breakfast at home. 2 weekdays they have lunch at school. They 3 have quick meals such as hamburgers and hot dogs. 4 on weekends...
查看完整题目与答案
相关题目：
【单选题】在配位滴定中常用指示终点的指示剂是 ( )
A.
甲基橙
B.
铬黑 T
C.
淀粉
D.
溴甲酚绿
查看完整题目与答案
【判断题】常用农业投入品可以在淘宝、京东、天猫等公共电商平台网购。（ ）
A.
正确
B.
错误
查看完整题目与答案
【单选题】常用铬黑 T 作指示剂的滴定分析是 ( )
A.
酸碱滴定
B.
沉淀滴定
C.
配位滴定
D.
氧化还原滴定
查看完整题目与答案
【单选题】They have produced _____ steel this year as they did five years ago.
A.
twice many as
B.
twice as many
C.
twice much as
D.
twice as much
查看完整题目与答案
【简答题】In many English homes, people eat four meals a day: breakfast, lunch, tea and dinner. People have breakfast from seven to nine in the morning. They eat porridge (粥) , eggs and bread. They also drink t...
查看完整题目与答案
【判断题】常用农业投入品可以在淘宝、京东、天猫等公共电商平台网购。( )
A.
正确
B.
错误
查看完整题目与答案
【判断题】铬黑T是常用的配位滴定指示剂。
A.
正确
B.
错误
查看完整题目与答案
【简答题】阅读短文,填入所缺单词: I have six silkworms. They are small and white. They have many ______. I put _______ on the leaves. They like _______ the leaves. They grow and grow. They ______ small, but now they are b...
查看完整题目与答案
【简答题】Sam and Ann have three meals a day: breakfast, lunch, 1 dinner. They have breakfast at home. 2 weekdays they have lunch at school. They 3 have quick meals such as hamburgers and hot dogs. 4 on weekend...
查看完整题目与答案
【简答题】Sam and Ann have three meals a day: breakfast, lunch 1 dinner. They have breakfast at home. 2 weekdays they have lunch at school. They 3 have quick meals such as hamburgers and hot dogs. 4 on weekends...
查看完整题目与答案