WDM系统最关键复用方式为 ()
A不同频率携带不同信号
B不同时隙携带不同信号
C不同信道码型携带不同信号
D不同偏振携带不同信号
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The Composing of the Daily Energy Usage in a Village 某农村的日常用能构成 A.Study the chart carefully and write an essay of 160-200 words. B.Your essay should cover these three points: 1)the composing of the energy usage in this village 2)possible reasons 3)your suggestions
1.有人认为网络可以让学习、工作更有效率
2.还有人认为网络让青少年沉迷,进而影响学习
3.你对于网络的看法
专线用户反应上网慢,最常见原因有哪些?()
A互联互通原因
BCMNET质量差
C用户操作错误
D其他
Strike a Balance between Work and Rest 在工作与休息间取得平衡 Write an essay of 160-200 words based on the drawing. In your essay, you should 1)describe the drawing briefly, 2)explain its intended meaning, and 3)give your comments.