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【单选题】
不能使一个关系从第一范式转化为第二范式的条件是( )。A.
每一个非主属性都完全函数依赖主属性
B.
每一个非主属性都部分函数依赖主属性
C.
在一个关系中没有非主属性存在
D.
主键由一个属性构成
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反馈参考答案：
举一反三
【单选题】He saluted as they passed. He saluted ____.
A.
while they had passed
B.
while they were passing
C.
though they were passing
D.
because they had passed
【单选题】He passed ______ hours in the library he acquired information relative to the subject he was going to expound.
A.
resulting
B.
resultative
C.
resultful
D.
resulted
【单选题】He passed ______ hours in the library he acquired information relative to the subject he was going to expound.
A.
resulting
B.
resultative
C.
resultful
D.
resulting
【单选题】—Jim’s passed the English exam, ______he? —I am not sure. Either you or he _____ passed it!
A.
hasn’t, have
B.
isn’t, has
C.
hasn’t, has
D.
wasn’t, have
【单选题】He _______ the Big Ben at half ______eight yesterday morning. [ ]
A.
passed;past
B.
passed; passed
C.
past;past
D.
past;passed
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