In the marine high voltage power system, _____.

A、
A、thereisstilllow-voltagea.c.powersupplyforsomepowerandlightingloads
B、
B、thereisonlylow-voltagea.c.lightingsystem
C、
C、thereisnotlow-voltagea.c.powersupplyatall
D、
D、thereisonlylow-voltaged.c.powersupply