题型:问答题 简答题 He reminded his daughter that only after _______a secretary and other staff_______able to concentrate on marketing.A.she could afford;would she beB.she could afford;she would beC.could she afford;would she beD.could she afford;would she be 查看答案
题型:问答题 简答题 在SDH保护环网结构中,()是系统中必不可少的网元节点,利用它的时隙保护功能,可以使得电路的安全可靠性大为提高。A.终端复用器(TM)B.分插复用器(ADM)C.再生中继器(REG)D.同步数字交叉连接设备(SDXC) 查看答案