皮皮学,免费搜题
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搜题
【单选题】
数据库系统阶段,数据( )。
A.
具有物理独立性,没有逻辑独立性
B.
具有物理独立性和逻辑独立性
C.
独立性差
D.
具有高度的物理独立性和一定程度的逻辑独立性
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【单选题】羟基蒽醌中,酸性最强的是
A.
1一羟基蒽醌
B.
2一羟基蒽醌
C.
1,2一二羟基蒽醌
D.
1,8一二羟基蒽醌
E.
3,6一二羟基蒽醌
【单选题】Research has shown that—in both sexes and across numerous cultures—attractive people are judged to be smarter, kinder, more honest and【C1】______. With some regularity we hear about the latest beauty c...
A.
pessimistic
B.
selfish
C.
trustworthy
D.
handsome
【单选题】羟基蒽醌中,酸性最强的是
A.
1-羟基蒽醌
B.
2-羟基蒽醌
C.
1,2-二羟基蒽醌
D.
1,8-二羟基蒽醌
E.
3,6-二羟基蒽酉昆
【判断题】Numerous people like to watch pole-vault because it combines the grace of a swimmer with the strength of a body builder.
A.
正确
B.
错误
【单选题】六 1 适合体积小且少量多样出货的货品其补货方式是( )
A.
由货架保管区补货至流力货架的拣选区
B.
由地板堆叠保管区补货至地板堆叠拣选区
C.
由地板堆叠保管区补货至货架拣选区
D.
货架上层向货架下层的补货
【简答题】Fill in the blanks with words and phrases below. Change the form where necessary. donate bring to mind endeavor emerge feature interpret enroll in generate ...
【判断题】Numerous people like to watch pole vaulting bacause it can combine the grace of a gymnast with the strength of a body builder.
A.
正确
B.
错误
【简答题】C Having a meal is an easy and delightful process for most people. However, for a woodpecker( 啄木鸟 ) , it's not that . To get dinner, a woodpecker has to hit its head against a tree numerous tim...
【单选题】下列蒽醌类化合物中,酸性最强的是
A.
1-羟基蒽醌
B.
2-羟基蒽醌
C.
1,2-二羟基蒽醌
D.
1,3-二羟基蒽醌
E.
2,3-二羟基蒽醌
【单选题】羟基蒽醌中,酸性最强的是
A.
1-羟基蒽醌
B.
2-羟基蒽醌
C.
1,2-二羟基蒽醌
D.
1,8-二羟基蒽醌
E.
3,6-二羟基蒽醌
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