A.3小區(qū),20M B.3小區(qū),2*20M C.1小區(qū),20M D.1小區(qū),2*20M
A.-48V,-12V B.+48V,-12V C.-48V,+12V D.+48V,+12V
A.UMPT B.LBBP C.USCU D.UPEU