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【单选题】
y ¢¢+ 6 y ¢+ 13 y = 0 的通解是( ),其中 为任意常数A.
y=e - 3x (C 1 cos2x-C 2 sin3x).
B.
y=e 2x (C 1 cos3x-C 2 sin3x).
C.
y=e - 3x (C 1 cos2x+C 2 sin2x).
D.
y=e - 3x (C 1 cos3x+C 2 sin2x).
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【简答题】与普通原棉相比,加工高含杂原棉时,开清棉工艺如何调整?
【单选题】Interest rates or rates of return on investments that have been adjusted for the effects of inflation are called _____ rates.
A.
real
B.
nominal
C.
effective
D.
stripped
【判断题】The nominal rates is the i nterest rates or rates of return that have been adjusted for inflation.
A.
正确
B.
错误
【单选题】Interest rates or rates of return on investments that have not been adjusted for the effects of inflation are called _____ rates.
A.
coupon
B.
stripped
C.
effective
D.
real
E.
nominal
【判断题】According to the portfolio selection theory, all investors who agree on the probability distribution for rates of return will hold the same tangency portfolio in combination with the riskless asset.
A.
正确
B.
错误
【单选题】The return rates for online purchases isapproximately ____ percent
A.
20
B.
25
C.
30
D.
35
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