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【简答题】
Mr Smith gave his wife money every Friday evening. His wife always spent it all the next Wednesday, so that for the next three days she had no money to spend at all. One day Mr Smith asked her," But how did you spend all that money?" She answered, "I don't know . "So one Friday evening, Mr Smith gave her money together with an exercise book and a pencil. He said to his wife ,"Please write down how you spend the money . "Next Tuesday, his wife had no money again. Mr Smith took the exercise book to see how she had spent it. "I have done what you told me ,"she said gladly. She had written "Friday, I got 18 pounds from Mr Smith. "on the first page, and on the second page, she wrote ,"Tuesday, I have spent it all. "
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【单选题】设X为随机变量, 由切比雪夫不等式,有 ( )。
A.
大于等于
B.
小于等于
C.
大于等于
D.
小于等于
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A.
正确
B.
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正确
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错误
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A.
正确
B.
错误
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A.
硫酸
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纯碱和烧碱
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合成氨
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化学肥料
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After you were fooled by your colleagues.
B.
After you were mistreated by a restaurant waiter.
C.
After you bought substandard goods at a plaza.
D.
After you were stolen on bus.
【单选题】已知集合P={x|x 4},集合Q={x|x>a},如果P Q=Φ,则实数a的取值范围是
A.
a<4< /div>
B.
a 4
C.
a>4
D.
a 4
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