多項(xiàng)選擇題

適合開(kāi)通adsl業(yè)務(wù)的線(xiàn)路長(zhǎng)度,對(duì)于0.4mm線(xiàn)經(jīng)應(yīng)小于();對(duì)于0.5mm線(xiàn)經(jīng)應(yīng)小于().()

A.3km.
B.4.5km.
C.5km.

微信掃碼免費(fèi)搜題