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.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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3.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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4.The two elements of a drawing line are ()
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5.The title block usually lies in the right corner of drawing sheet
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6.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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7.打印机按大小分为A3打印机与A4打印机。()
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8.The new library is times the size of the old one.A.the nineB.nineC.ninthD.the ninth
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9.Euclide 空间(含紧性连通)A2,A3,A4,A7.
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10.设a1=(1,1,1,2),a2=(3,1,2,5),a3=(2,0,1,3),a4=(1,-1,0,1)求a1,a2,a3,a4的一个极大无关组,并用它表示其余向量.