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【简答题】
(Ⅰ)已知z∈C,且|z|-i= . z +2+3i(i为虚数单位),求复数 z 2+i 的虚部. (Ⅱ)已知z 1 =a+2i,z 2 =3-4i(i为虚数单位),且 z 1 z 2 为纯虚数,求实数a的值.
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A.
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B.
)数据库表和自由表都支持表间联系和参照完整性
C.
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D.
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A.
数据库表和自由表都可以用表设计器来建立
B.
数据库表和自由表都支持表间联系和参照完整性
C.
自由表可以添加到数据库中成为数据库表
D.
数据库表可以从数据库中移出成为自由表
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over
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off
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by
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