问题
单项选择题
旅客列车运行途中发生客车空气弹簧故障时须限速运行，运行速度不得超过（）km/h。
A.100
B.120
C.140
D.160
答案
参考答案：B
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旅客列车运行途中发生客车空气弹簧故障时须限速运行，运行速度不得超过（）km/h。
A.100
B.120
C.140
D.160
参考答案：B
An analyst does research about interest rate risk of fixed income securities and gathers the following information about three option-free bonds selling at par:
| Bond | Coupon Rate | Maturity (Years) |
| 1 | 5% | 4 |
| 9 | 5% | 9 |
| 3 | 7% | 9 |
A. Bond 1.
B. Bond 2.
C. Bond 3.