题目：
Which of the following statements concerning the effects of interest rate volatility on bonds with embedded options is FALSE（）
A. As yield volatility increases, the value of callable bonds decreases.
B. A putable bond’s value is its straight bond value plus the value of the embedded put option.
C. A callable bond’s value is its straight bond value plus the value of the embedded call option.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
．将磁感应强度的大小从原来的B1 变为 B2，结果相应的弧长变为原来的一半，则
