电容器用熔断器保护时，单台电容器可按电容器额定电流的（）倍选用熔体的额定电流。

A、辅助开关
B、真空灭弧室
C、波纹管
D、操动机构

A.contradicted them by saying；make
B.countered by saying；make for
C.opposed by saying；make up
D.have been lagged behind；slip off

A、短路
B、开路
C、工作接地
D、保护接地