问题
判断题
任何速率的PDH信号在向SDH信号转变时都要经过映射、定位、复用三个步骤。
答案
参考答案：对
搜题请搜索小程序“爱下问搜题”
任何速率的PDH信号在向SDH信号转变时都要经过映射、定位、复用三个步骤。
参考答案：对
用方框中所给词的适当形式填空，每词限用一次。
62. It’s said that the sports meeting will be ________ on April 18th. 63.Ivan is so careless that his homework is full of ________. 64. My father bought me two storybooks but I like ________ of them, 65.Her beautiful roses won the ________ prize at the flower show. |