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【单选题】
对于GMDSS备用电源的要求有() 。
A.
不论是主电源还是应急电源工作时,都会一方面正常向船舶设备提供直流和交流供电,另 一方面向蓄电池(备用电源)充电
B.
只有主电源工作时,向蓄电池(备用电源)充电
C.
只有当应急电源工作时,向蓄电池(备用电源)充电
D.
不论是主电源还是应急电源,都不会向蓄电池(备用电源)充电
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