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【单选题】
有 12 个实体类型,并且它们之间存在着 15 个不同的二元联系,其中 4 个是 1 : 1 联系类型, 5 个是 1 : N 联系类型, 6 个是 M : N 联系类型,根据转换规则,这个 ER 结构最少转换的关系模式有( )A.
17 个
B.
18 个
C.
23 个
D.
27 个
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举一反三
【单选题】we can never enjoy a white christmas in new zealand because the christmas_____summer here.
A.
falls in
B.
happens in
C.
take place in
D.
have spent
【单选题】We can never enjoy a white Christmas in Australia because the Christmas _______ summer there.
A.
falls in
B.
happens in
C.
takes place in
D.
comes out in
【单选题】We can never enjoy a white Christmas in New Zealand because the Christmas ______summer here.
A.
falls in
B.
happens in
C.
takes place in
D.
comes out in
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