从税收公平角度看()应排在较高地位。
A.比例税率
B.累进税率
C.累退税率
D.边际税率
参考答案:B
I don't _____ of your sending your daughter to Britain to study,because she is too young. [ ]
A. agree
B. approve
C. support
D. assess
设ψ(X)=XAXT,φ(X)=XAXT是正定二次型,其中A=(aij),B=(bij),令cij=aijbij,以C=(cij)作二次型f(X)=XCXT,证明:f是正定的.