阶步
参考答案：
在断层滑动面上常有与擦痕呈直交的微细陡坎，这种微细陡坎称为阶步。
居民用电报装计量验收从安装到验收的时间间隔不超过（）个月。
A.半
B.一
C.二
D.三
An investor is concerned about interest rate risk. Which of the following bonds has the least interest rate risk The bond with:
A. 5% yield and 10-year maturity.B. 5% yield and 15-year maturity.C. 6% yield and 10-year maturity.
