A.4:4:2 B.4:5:1 C.4:3:3 D.5:4:1
A.99.5% B.99.9% C.99.0% D.99.7%
A.基站設(shè)備代維 B.基站發(fā)電代維 C.基站物業(yè)保潔代維 D.集客代維