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【单选题】
下面映射中是的是A.
f ： N → N ，
B.
f ： N → í 0,1 ý ，
C.
f ： Z ＋ → R ， f ( x )=3 x
D.
f ： R → R ， f ( x )= x 3
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【判断题】Refer to Exhibit 5-1. A price floor set at $15 would create a shortage of 20 units
A.
正确
B.
错误
【简答题】如果只声明变量而不赋值,则默认值为
【简答题】票据和结算凭证的金额必须以中文大写和阿拉伯数字同时记载，二者必须一致，否则以中文大写为准。 （ ）
【判断题】Refer to Exhibit 5-1. A price floor set at $10 would not cause a surplus.
A.
正确
B.
错误
【简答题】票据和结算凭证的金额必须以中文大写和阿拉伯小写数字同时记载，两者必须一致，否则以中文大写为准。 ( )
【判断题】Refer to Exhibit 5-1. A price ceiling set at $35 would not cause a shortage.
A.
正确
B.
错误
【单选题】A bus took him to the West End, where, among the crazy coloured fountains of illumination, shattering the blue dusk with green and crimson fire, he found the cafe of his choice, a tea-shop that had go...
A.
modern realistic commercialism existed behind the luxurious appearance
B.
there was a fundamental falseness in the style. and the appeal of the caf6
C.
the architect had made a sensible blend of old and new building materials
D.
the cafe was based on physical foundations and real economic strength
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