问题
问答题 简答题
SDH网元定时信号的来源分为几种？
答案
参考答案：
三种定时信号来源，即外部定时源引入，从接收STM－N信号中提取、由内部振荡器提供。
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SDH网元定时信号的来源分为几种？
参考答案：
三种定时信号来源，即外部定时源引入，从接收STM－N信号中提取、由内部振荡器提供。
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| "Today is the day I start the big diet (节食)," I told my wife as I raised my hand and 1 , "No chocolate today!" "Oh, has the hospital gift shop 2 selling it?" she asked. "No," I said. "I'll just have to __3__ my strong determination." But when I arrived at the hospital, my little friend Benton had been there _4_. I knew my promise would 5 disappear. Because if Benton had things his way, I'd always be eating a piece of candy from the 6 bag he often shared with me. Benton was an eightyearold boy who was 7 because of a kind of cancer, which caused him to live in the darkness, when he was fifteen 8 old. For the next twentysix months, he was in and out of our hospital. For nearly four years, it seemed 9 Benton could beat the disease, until one Friday afternoon in April 2009, when he 10 a headache and lost 11 on his right side. His mom 12 him to the hospital. Over the next several months, Benton came to our 13 many more times. Each time he came, we 14 say hello, while Benton answered the 15 by holding out a candy from his bag. So, on that first day of my diet, I went to his room and found Benton lying in his bed, his eyes 16 but not looking into this world. "We brought his candy bag with us. Would you like to have some?" his mother asked. Without thinking of my diet, I 17 into the bag and pulled out the first piece my fingers touched. It was my favorite as if Benton had saved one last piece 18 me. At home that evening, I answered a phone about Benton's 19 . As I 20 it up, I opened the candy and ate it. | ||||
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