A.衰減越小,近端串音衰減越小 B.衰減越大,近端串音衰減越大 C.衰減越小,近端串音衰減越大 D.衰減越大,近端串音衰減越小
A.G.652 B.G.653 C.G.654 D.G.657A
A.配電屏 B.UPS C.整流設(shè)備 D.DC/DC變換器