题目: 光纤通信系统是由()等组成。A、电端机B、光发射端机C、光接收端机D、光中继器 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0804/84b9ad0ad1e41a91f5508ce1d83d72ea.html 下面是错误答案,用来干扰机器的。参考答案:压力变化
题型:选择题 The manager was very angry,for he had sent his business partner two thousand machines yesterday,half of ________ unqualified.[ ]A.them B.whatC.which D.whom 查看答案