第一心音增强见于（）
A.二尖瓣关闭不全
B.二尖瓣狭窄
C.左心衰竭
D.心肌梗死
E.一度房室传导阻滞
参考答案：B
A semiannual-pay bond is callable in five years at $1080. The bond has an 8% coupon and 15 years to maturity. If an investor pays $ 895 for the bond today, what are the yield to call (YTC) and the yield to maturity (YTM), respectively YTC YTM（）①A. 10.77% 9.31% ②B. 12.07% 9.31% ③C. 10.77% 10.21%
A. ①
B. ②
C. ③
测量骨盆入口横径的径线是（）
A.骶耻外径
B.髂嵴间径
C.坐骨结节间径
D.对角径
E.后矢状径
