皮皮学，免费搜题
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【单选题】
听力原文：W: Come along, now. Open your mouth. I can't give you the injection with your mouth closed, can I? M: I don't want an injection. I hate needles. Q: Where is the conversation most probably taking place? (14)A.
At the dentist' s.
B.
At a grocery
C.
At a lawyer' s.
D.
At a psychiatrist' s.
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皮皮学刷刷变学霸
举一反三
【单选题】唯一约束与主键约束的区别是( )。
A.
唯一约束的值不允许为空，主键约束的值允许为空
B.
唯一约束的值允许为空，主键约束的值不允许为空
C.
唯一约束就是主键约束
D.
唯一约束和主键约束的值都不允许为空
【简答题】Questions 5-7 Now you will hear the next part of the recording. Choose three letters a-g. 17 曲目 17.mp3: Which three activities does Victoria enjoy? a. Contemporary dance b. Yoga c. Film and drama d. C...
【单选题】唯一约束与主键约束的区别是()
A.
唯一约束的字段可以为空值
B.
唯一约束的字段不可以为空值
C.
唯一约束的字段值可以不是唯一的
D.
唯一约束的字段值不可以有重复的值
【单选题】question 17.mp3:
A.
Choose one’s own system of marking.
B.
Underline the key words and phrases.
C.
Make as few marks as possible.
D.
Highlight details in a red color.
【判断题】禹治水有功众酋长拥戴,每个州都向他进献贡金,禹就命人把进献的贡金,铸造九鼎,并把各州内的山川名物、珍禽异兽铸在上面,以示天下太平。后来,在古代,鼎视为立国的重器,是政权的象征。
A.
正确
B.
错误
【单选题】Name the theme of the Earth Day.
A.
Trees for the Earth
B.
End plastic pollution
C.
Helping the environment
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