A.23.15 B.20.1 C.19.3 D.25.9
A.資源子網(wǎng) B.通信子網(wǎng) C.局域網(wǎng) D.廣域網(wǎng)
A.對(duì)方履行之前 B.對(duì)方要求履行之前 C.自己的合同權(quán)利實(shí)現(xiàn)之前 D.對(duì)方未應(yīng)己方的要求履行之前