61.为满足供电的可靠性,要求电力系统至少具备的备用容量为( )

61.为满足供电的可靠性,要求电力系统至少具备的备用容量为( )

A.5%~10%

B.10%~15%

C.15%~20%

D.20%~30%

正确答案是B