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【简答题】
.选择你喜欢的方法解方程：x 2 +2x-2=0．
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【单选题】When a tax is placed on the sellers of a product, buyers pay
A.
more, and sellers receive more than they did before the tax.
B.
more, and sellers receive less than they did before the tax.
C.
less, and sellers receive more than they did before the tax.
D.
less, and sellers receive less than they did before the tax.
【单选题】When a binding price floor is imposed on a market to benefit sellers,
A.
no sellers actually benefit.
B.
some sellers benefit, but no sellers are harmed.
C.
some sellers benefit, and some sellers are harmed.
D.
all sellers benefit.
【单选题】对消防水泵的维护保养，每周消防水泵运行前，检查主、备电源切换正常，检查备用电源，看能否保证在______s使水泵投入正常运行。
A.
30
B.
40
C.
50
D.
60
【单选题】在房间里有10个人,分别佩戴从1号到10号的纪念章,任选3人记录其纪念章的号码。 则最大号码为5的概率是( ).
A.
1/2
B.
1/12
C.
1/20
D.
1/5
【简答题】在房间里有10个人，分别佩戴从1号到10号的纪念章，任选3人记录其纪念章的号码．求：(1)最小号码为5的概率；(2)最大号码为5的概率．
【单选题】在房间里有10个人,分别佩戴从1号到10号的纪念章,任选3人记录其纪念章的号码,则最大号码为5的概率为( )
A.
1/12
B.
1/20
C.
1/6
D.
1/10
【简答题】Many sellers tend to refuse personal checks for fear of______.
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