公式()为透镜的有效镜度的求解公式。
A、Fe=F/(1+dF)
B、Fe=F/(1-dF)
C、Fe=F/(dF-1)
D、Fe=1+Df/F
参考答案:B
心血瘀阻之胸痹代表方为
A.素体阳虚,阴寒凝滞,气血痹阻,心阳不振B.心气不足,阴血亏耗,血行瘀滞C.血行瘀滞,胸阳痹阻,心脉不畅D.肝失疏泄,气机郁滞,心脉不和E.阳气虚衰,胸阳不振,气机痹阻,血行瘀滞
A non-callable bond with 18 years remaining maturity has an annual coupon of 7 percent and a $1000 par value. The current yield to maturity on the bond is 8 percent. Which of the following is closest to the effective duration of the bond()
A. 9.63.
B. 11.89.
C. 8.24.