电力系统的自动低频减负荷方案，应由（）负责制定并监督其执行。
A.系统调度部门
B.生产管理部门
C.检修部门
D.运行部门
参考答案：A
An analyst determines that an 8 percent option-free bond, maturing in 2015, would experience a 3 percent change in price if market interest rates rise by 50 basis points. If market interest rates fall by 50 basis points, the bond’s price would increase by:（）
A. exactly 3%.
B. less than 3%.
C. more than 3%.
简述设备驱动程序通常要完成哪些工作？
