The size of A3 is two times of A4 drawing sheet
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1.The size of A3 is two times of A4 drawing sheet
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2.已知 a1 , a2 , a3 , a4 成等比数列,且 a1 a2 a3 a4 ln(a1 a2 a3 ) .若 a1 1 ,则A、a1 a3 , a2
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3.For a A4 horizontal sheet, the binding gap on the left side of the sheet should be mm
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4.,则A1 A2 A3 A4=
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5.设有向量组A:a1a2a3a4,其中a1,a2,a3线性无关,则()
A: a1,a3线性无关
B: a1,a2,a3,a4线性无关
C: a1,a2,a3,a4线性相关
D: a2,a3,a4线性无关
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6.关系模式R(A1,A2,A3,A4,A5),如果(A1,A2)→A3,(A3,A4)→A5, 则R的候选键为( )。
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7.The two elements of a drawing line are ()
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8.The title block usually lies in the right corner of drawing sheet
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9.关系模式R(A1,A2,A3,A4,A5,A6),如果A2à(A3,A5); (A1,A3)àA6; (A2,A6)à A4,则R的候选键为_________
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10.两张A4纸是不是等于一张A3纸?