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【单选题】
设个体域为有理数集 Q ,则以下谓词公式中为假的是( ). prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>A.
x ∃ y ( xy=0 )
B.
x ∃ y ( xy=1 )
C.
∃ y x ( xy=x )
D.
x ∃ y ( xy=y )
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举一反三
【单选题】Topic 45 Session 1 (Vocabulary 4-1) Read the sentences and choose the correct words or phrases. The company’s software _________ design all the new programs.
A.
testers
B.
developers
【单选题】Topic 45 Session 1 (Vocabulary 4-6) Read the sentences and choose the correct words or phrases. The membership / software life cycle explains why there are so many jobs in software development.
A.
membership
B.
software life cycle
【单选题】关于喇叭声响不正常故障，甲说喇叭声响不正常故障的原因可能喇叭支架松动；乙说喇叭声响不正常故障的原因可能是喇叭电阻过大。你认为以上观点（）。
A.
甲正确
B.
乙正确
C.
甲乙都正确
D.
甲乙都不正确
【单选题】Topic 45 Session 1 (Vocabulary 4-5) Read the sentences and choose the correct words or phrases. ________ are most commonly found in classrooms.
A.
Educators
B.
Freelancers
【单选题】Topic 45 Session 1 (Vocabulary 4-2) Read the sentences and choose the correct words or phrases. The _________ is a group that supports technological innovation.
A.
IEEE
B.
professional development
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