接种后引起的过敏反应(如荨麻疹)属于下列哪种类型的变态反应()
A.Ⅰ型变态反应
B.Ⅱ型变态反应
C.Ⅲ型变态反应
D.Ⅳ型变态反应
参考答案:A
把抛物线y=2x2先沿x轴方向向右平移2个单位,再沿y轴方向向上平移3个单位所得抛物线的解析式是______.
For amortizing bonds that have the same maturity date, the reinvestment risk for an investor holding the bonds to maturity is greatest for the bonds that are selling at:()
A. a premium to par value.
B. a discount to par value as a result of the bonds being issued as zero-coupon bonds.
C. a discount to par value as a result of market yields increasing after the bond was issued.