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【多选题】
电气安全评价包括两方面： 和 。A.
经济性
B.
有效性
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反馈参考答案：
举一反三
【简答题】an author 2. a speaker 3. a trainer 4. a consultant A someone who talks at public B someone who helps people to improve at a sport , skill or school subject C someone who advises people on...
【单选题】根据数据库规范化理论,下面命题中正确的是( )
A.
若R∈2NF，则R∈3NF
B.
若R∈1NF，则R不属于BCNF
C.
若R∈3NF，则R∈BCNF
D.
若R∈BCNF，则R∈3NF
【单选题】根据数据库规范化理论,下面命题中正确的是( )
A.
若R∈2NF,则R∈3NF
B.
若R∈BCNF,则R∈3NF
C.
若R∈1NF,则R不属于BCNF
D.
若R∈3NF,则R∈BCNF
【简答题】Match the jobs(1-4) with their definitions(A-D) an author a speaker a trainer a consultant A. someone who talks at a public . B. Someone who helps people to improve at a sport, skill or school su...
【单选题】When someone writes with ______ ink, only those people who have a special ilquid solution can bring the writing into view to discover the meaning of the message.
A.
consistent
B.
reflex
C.
obvious
D.
invisible
【单选题】If someone writes a book about teaching languages, who are their target readers?
A.
language teachers
B.
language learners
C.
language writers
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