淋巴瘤最常见的发病年龄是（）
A.40～60岁
B.20～40岁
C.20岁以下
D.60岁以上
E.50岁以上
参考答案：B
根据GB/T 5117-1995碳钢焊条型号是以熔敷金属的力学性能、焊接位置、药皮类型和焊接电流种类划分的。( )
Using the following information about spot rates, what is the price of a three-year bond with $100 par and annual coupon payments of 5 percent One-year rate: 4.78% Two-year rate: 5.56% Three-year rate: 5.98%（）
A. $97.47.
B. $96.33.
C. $98.87.
