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问题
判断题
光进铜退环境下的家庭接入方式分为FTTH、FTTB+LAN、FTTB+DSL三种。
答案
参考答案：对
选择题
I couldn't wait
the present as soon as I got it from my parents.
A. to open
B. open
C. openeded
D. opening
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名词解释
腐解作用 decay
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