梁的惯性矩是以（）为轴的。
A.中性轴
B.轴的中心线
C.轴的中心线的垂直线
D.都不对
参考答案：A
下列归纳的乳牙髓腔特点不正确的是（）
A.髓室大
B.髓壁薄
C.髓角高
D.根管粗
E.根尖孔小
A bond has a par value of $1000, a time to maturity of 20 years, a coupon rate of 10 percent with interest paid annually, a current price of $ 850, and a yield to maturity (YTM) of 12 percent. If the interest payments are reinvested at 10 percent, the realized compounded yield on this bond is:（）
A. 10.00%.
B. 12.0%.
C. 10.9%.
