下列不属于低钾血症临床表现的是（）
A.腱反射减弱
B.肠鸣音亢进
C.心率增快
D.心电图示T波增宽，低平
E.心电图出现U波
参考答案：B
An investor is considering the purchase of two bonds. One of the bonds is tax-exempt and yields 4.5% while the other bond is taxable and yield 6.0%. If the two bonds are alike in all other characteristics, the rate that would make the investor indifferent between the two bonds is closest to:（）
A. 9.0%.
B. 25.0%.
C. 27.0%.
心电图的测量方法
