题目内容

Fill in the blanks with the correct form of the words in the box.recede ▍ feeblesymptom ▍ dismay ▍ paralyzeweary▍brink▍gasp1) Strong manufacturing data in the US and China have eased fears of a slowdown in global growth and suggest that a _______ European economy may diverge from robust activity elsewhere.2)Just as I started to think that I was never gong to get well, the illness began to ________.3) The blizzard moved south, turning into an icy rain that _________the airports for three days.4) In this introduction we have diagnosed some of the causes of the illness and, in the following chapters, we will draw attention to its various unpleasant __________.5) In those days, divorce under any circumstances was socially unacceptable and there was great ________ in the family who went through it.6) Every time she talked about being rejected in her hunt for a job, she seemed on the ______ of tears.7) The audience let out a collective ______.8) But the American public is and preoccupied by the domestic economic disaster.

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当个体域为有限集时,如D={a1,a2,…,an},对任意谓词A(x)都有()。

A. ∀xA(x)⇔A(a1)∧A(a2)∧…∧A(an)
B. ∃xA(x)⇔A(a1)∧A(a2)∧…∧A(an)
C. ∀xA(x)⇔A(a1)∨A(a2)∨…∨A(an)
D. ∃xA(x)⇔A(a1)∨A(a2)∨…∨A(an)

谓词公式如同命题公式,根据真值可分为永真式、矛盾式和可满足式。

A. 对
B. 错

设A、B是任意两个谓词公式,对A、B的任何赋值,若其真值相同,则称A与B是等价的,记作A ⇔B;若A→B是有效的,则称A蕴含B,记作A=>B。

A. 对
B. 错

谓词公式中,量词之前的否定联结词,不是否定该量词,而是否定该量词及其辖域 。

A. 对
B. 错

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