C.S.I.SWITCHING790307ASUPPLY¥4690.30去看看三事机电科技发布了C.S.I. V542 SWITCHING POWER SUPPLY PCB MODULE 790307AC.S.I.SWITCHING790307ASUPPLY¥57700去看看浩元科技发布了C.S.I. V542 SWITCHING POWER SUPPLY PCB MODULE 790307A