A.扭曲 B.交叉 C.順直 D.重疊
A.30S B.40S C.50S D.60S
A.中斷業(yè)務(wù)進(jìn)行測試 B.進(jìn)行環(huán)路測試 C.不中斷業(yè)務(wù)進(jìn)行測試 D.進(jìn)行串接測試