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【多选题】
矩阵的迹等于矩阵的对角线元素之和,以下方法中能求矩阵迹的有( )。A.
trace(A)
B.
sum(diag(A))
C.
sum(eig(A))
D.
prod(eig(A))
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【简答题】阅读理解。 Having a husband means an extra seven hours of housework each week for women, according to a new study. For men, getting married saves an hour of housework a week. 'It's a well-known pattern ,' ...
【单选题】如图2-8所示,某输出变压器的副绕组有中间抽头,以便接8Ω或2Ω的扬声器,两者均能达到阻抗匹配,则副绕组两部分匝数比N2/N3为——
A.
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B.
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C.
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D.
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