统型应急电源控制箱合闸时，空气断路器跳闸。说明有短路现象，应检查负载、（）、输出电容是否短路。

A.整流模块U2

B.整流变压器

C.接触器KM

D.控制按钮

An investor most concerned with reinvestment risk would be least likely to:（）

A. eliminate reinvestment risk by holding a coupon bond until maturity.

B. prefer a lower coupon bond to a higher coupon bond.

C. be more concerned in a decreasing interest rate environment.