问题
多项选择题
WDM光网络中光电混合式光分组交换机包括（）几个部分。
A.包同步和定时提取
B.包缓存和分组
C.包路由选择
D.包缓存和交换
答案
参考答案：A, C, D
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WDM光网络中光电混合式光分组交换机包括（）几个部分。
A.包同步和定时提取
B.包缓存和分组
C.包路由选择
D.包缓存和交换
参考答案：A, C, D
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| Big schoolbags have been a serious problem for students for a long time. Maybe your schoolbag is too 1 to carry, and it troubles you a lot 2 you want to find a book out to read. Now an e-textbook will 3 you. It is said that e-textbooks are going to be 4 in Chinese middle schools. An e-textbook, in fact, is a small 5 for students. It is much 6 than a usual schoolbag and easy to carry. Though it is as small as a book, it can 7 all the materials (材料) for study. The students can read the text page by page on the 8 , take notes with the pointer (屏写笔), or even " 9 " their homework to their teachers by sending e-mails. All they have to do is to press a button. Some people say e-textbooks are good, but some say they may be 10 for the students' eyes. What do you think of it? | ||||
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