Not everyone has realized what ________important part the balance of ________nature plays in their life.

A．an；the

B．/；the

C．an；/

D．the；/

直流熔断器的额定电流值不大于最大负载电流的1倍。交流熔断器的额定电流值：照明回路按实际负荷配置，其它回路不大于最大负荷电流的1.5倍。（）