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【单选题】
It is implied in the last paragraph that ______.
A.
bulls and bears are now working for people
B.
people keep bears and bulls as their pets
C.
laws have put stock markets under control
D.
people can enjoy their friendship with bears and bulls
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【简答题】阅读下面一篇短文,判断下列句子是否符合短文内容,符合的用 “ 正确 ” 表示,不符合的用 “ 错误 ” 表示。 Suggestions for travelling Don’ts Dos 1. Spit (吐痰) or drop litter everywhere 2. Talk loudly on your mobile phone 3. Take off your shoes on p...
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【单选题】下列预防食物中毒的有效措施是()
A.
清清洗干净马铃薯
B.
食用前将四季豆用清水浸泡，然后烧熟
C.
风干肉类
D.
选用色彩鲜艳的菇类
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【单选题】某些连锁药店将个别药品项目以特别低的价格出售,以吸引更多的消费者购买其他以正常价格出售的药品。这种定价策略称为( )
A.
招徕定价
B.
特殊定价
C.
差异定价
D.
声望定价
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【单选题】关于预防常见化学性食物中毒的措施,不正确的做法是( )。
A.
为有效去除蔬菜水果农药残留，用水冲洗即可
B.
生豆浆应煮沸
C.
四季豆烫煮且炒透
D.
腌制肉制品的亚硝酸盐按要求限量
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【简答题】关系演算分为元组关系演算和（ ）
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【多选题】Each given topic sentence is followed by several additional sentences. Cross off the sentences that are off-topic. TS: The development of watches is an interesting story.
A.
1) A watch is a small timepiece designed to be carried by a person.
B.
2) The first watches were called pocket watches.
C.
3) The first watches were very large and heavy.
D.
4) It is believed that the first pocket watch was made in Germany in about 1510.
E.
5) The earliest known British clock was put up in about 1386.
F.
6) During the sixteenth century watchmaking spread from Germany to England, France and Switzerland.
G.
7) For a long time English clocks were the most famous in the world.
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【判断题】关系代数是用对关系的运算来表达查询的，而关系演算是用谓词表达查询的，它又分为元组关系演算和域关系演算两种。()
A.
正确
B.
错误
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【简答题】按谓词变元的不同，关系演算可分为元组关系演算和______。
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【简答题】关系演算可以分为元组关系演算和（）关系演算。
查看完整题目与答案
【简答题】1 One word is wrong in each sentence. Cross it out and write the correct word. ► The sun circles the earth. moon 1 The planets are in the solar space. ____ 2 The earth revolves around t...
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【简答题】阅读下面一篇短文,判断下列句子是否符合短文内容,符合的用 “ 正确 ” 表示,不符合的用 “ 错误 ” 表示。 Suggestions for travelling Don’ts Dos 1. Spit (吐痰) or drop litter everywhere 2. Talk loudly on your mobile phone 3. Take off your shoes on p...
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【单选题】下列预防食物中毒的有效措施是()
A.
清清洗干净马铃薯
B.
食用前将四季豆用清水浸泡，然后烧熟
C.
风干肉类
D.
选用色彩鲜艳的菇类
查看完整题目与答案
【单选题】某些连锁药店将个别药品项目以特别低的价格出售,以吸引更多的消费者购买其他以正常价格出售的药品。这种定价策略称为( )
A.
招徕定价
B.
特殊定价
C.
差异定价
D.
声望定价
查看完整题目与答案
【单选题】关于预防常见化学性食物中毒的措施,不正确的做法是( )。
A.
为有效去除蔬菜水果农药残留，用水冲洗即可
B.
生豆浆应煮沸
C.
四季豆烫煮且炒透
D.
腌制肉制品的亚硝酸盐按要求限量
查看完整题目与答案
【简答题】关系演算分为元组关系演算和（ ）
查看完整题目与答案
【多选题】Each given topic sentence is followed by several additional sentences. Cross off the sentences that are off-topic. TS: The development of watches is an interesting story.
A.
1) A watch is a small timepiece designed to be carried by a person.
B.
2) The first watches were called pocket watches.
C.
3) The first watches were very large and heavy.
D.
4) It is believed that the first pocket watch was made in Germany in about 1510.
E.
5) The earliest known British clock was put up in about 1386.
F.
6) During the sixteenth century watchmaking spread from Germany to England, France and Switzerland.
G.
7) For a long time English clocks were the most famous in the world.
查看完整题目与答案
【判断题】关系代数是用对关系的运算来表达查询的，而关系演算是用谓词表达查询的，它又分为元组关系演算和域关系演算两种。()
A.
正确
B.
错误
查看完整题目与答案
【简答题】按谓词变元的不同，关系演算可分为元组关系演算和______。
查看完整题目与答案
【简答题】关系演算可以分为元组关系演算和（）关系演算。
查看完整题目与答案
【简答题】1 One word is wrong in each sentence. Cross it out and write the correct word. ► The sun circles the earth. moon 1 The planets are in the solar space. ____ 2 The earth revolves around t...
查看完整题目与答案