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【单选题】
唯一约束与主键约束的一个区别是?
A.
唯一约束的列的值不可以有重复值
B.
唯一约束的列的值可以不是唯一的
C.
唯一约束的列不可以为空值
D.
唯一约束的列可以为空值
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参考答案：
举一反三
【单选题】Listen to a long conversations and choose the best answer to each question you hear. What do we know about those people who are invited to the party B2-U3_3_2.mp3:
A.
They like the lifestyle at the beginning of the 1960s.
B.
They are inspired by the entertainment of the 1960s.
C.
They are big fans of famous actresses in the 1960s.
D.
They are likely to dress like people in the 1960s.
查看完整题目与答案
【单选题】Listen to a long conversations and choose the best answer to each question you hear. U3_3_2.mp3: Q3-3-2_1.mp3:
A.
They like the lifestyle at the beginning of the 1960s.
B.
They are inspired by the entertainment of the 1960s.
C.
They are big fans of famous actresses in the 1960s.
D.
They are likely to dress like people in the 1960s.
查看完整题目与答案
【判断题】当删除重复性商品时,如果某品牌大部分单品都列入淘汰名单,必要时就要考虑淘汰整个品牌,有利于提高整个供应链效率:
A.
正确
B.
错误
查看完整题目与答案
【简答题】Listen to the two conversations. Check ( √ ) Christiane’s and Dan’s job(s). Audio Track 4-3-2.mp3: Christiane AmanpourA. news anchor B. international correspondent
查看完整题目与答案
【单选题】“You are wanted on ______ phone.” is another way to say “Someone wants to speak to you by ________phone.”
A.
/ , /
B.
/ , the
C.
the , /
D.
the, the
查看完整题目与答案
【简答题】Section B 2016-6-sectionB.mp3: Directions: In this section, you will hear two long conversations. At the end of each conversations you will hear four questions. Both the conversations and the question...
查看完整题目与答案
【判断题】燃油对汽车发动机工作,及其他汽车零件的耐久性、可靠性、经济性和工作能力发挥具有重要作用。
A.
正确
B.
错误
查看完整题目与答案
【单选题】'Quick' is another way of ______ fast.
A.
saying
B.
to say
C.
say
查看完整题目与答案
【单选题】假设基本门电路的符号为 已知如下电路 问该电路所实现的正确的逻辑运算为______。
A.
P = A XOR B
B.
P = NOT (A AND B) AND (A AND B)
C.
P = (A AND (NOT B)) AND ((NOT A) OR B)
D.
P = (A OR B) AND (A AND (NOT B))
查看完整题目与答案
【单选题】'Nope' is the another way to say()
A.
no
B.
nine
C.
none
D.
nobody
查看完整题目与答案
相关题目：
【单选题】Listen to a long conversations and choose the best answer to each question you hear. What do we know about those people who are invited to the party B2-U3_3_2.mp3:
A.
They like the lifestyle at the beginning of the 1960s.
B.
They are inspired by the entertainment of the 1960s.
C.
They are big fans of famous actresses in the 1960s.
D.
They are likely to dress like people in the 1960s.
查看完整题目与答案
【单选题】Listen to a long conversations and choose the best answer to each question you hear. U3_3_2.mp3: Q3-3-2_1.mp3:
A.
They like the lifestyle at the beginning of the 1960s.
B.
They are inspired by the entertainment of the 1960s.
C.
They are big fans of famous actresses in the 1960s.
D.
They are likely to dress like people in the 1960s.
查看完整题目与答案
【判断题】当删除重复性商品时,如果某品牌大部分单品都列入淘汰名单,必要时就要考虑淘汰整个品牌,有利于提高整个供应链效率:
A.
正确
B.
错误
查看完整题目与答案
【简答题】Listen to the two conversations. Check ( √ ) Christiane’s and Dan’s job(s). Audio Track 4-3-2.mp3: Christiane AmanpourA. news anchor B. international correspondent
查看完整题目与答案
【单选题】“You are wanted on ______ phone.” is another way to say “Someone wants to speak to you by ________phone.”
A.
/ , /
B.
/ , the
C.
the , /
D.
the, the
查看完整题目与答案
【简答题】Section B 2016-6-sectionB.mp3: Directions: In this section, you will hear two long conversations. At the end of each conversations you will hear four questions. Both the conversations and the question...
查看完整题目与答案
【判断题】燃油对汽车发动机工作,及其他汽车零件的耐久性、可靠性、经济性和工作能力发挥具有重要作用。
A.
正确
B.
错误
查看完整题目与答案
【单选题】'Quick' is another way of ______ fast.
A.
saying
B.
to say
C.
say
查看完整题目与答案
【单选题】假设基本门电路的符号为 已知如下电路 问该电路所实现的正确的逻辑运算为______。
A.
P = A XOR B
B.
P = NOT (A AND B) AND (A AND B)
C.
P = (A AND (NOT B)) AND ((NOT A) OR B)
D.
P = (A OR B) AND (A AND (NOT B))
查看完整题目与答案
【单选题】'Nope' is the another way to say()
A.
no
B.
nine
C.
none
D.
nobody
查看完整题目与答案
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