数码相机是将光学图像信息转换成电子信号，并储存在（）中的一种相机。
A.电子管
B.晶体管
C.电子介质
D.胶卷
参考答案：C
下列说法不正确的是()。
A．主频越高，运算速度越快
B．字长越长，运算速度越快
C．内存容量越大，运算速度越快
D．存取周期越大，运算速度越快
Which of the following statements about the value of a callable bond is FALSE （）
A. The value of the callable bond is less than the value of an option-free bond in an amount equal to the value of the call option.
B. The value of a callable bond equals the value of the bond without the option plus the option value.
C. The value of the call option is greater at lower yields so that as the yield falls, the difference in price between a straight bond and a callable bond increases.
