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题目内容
Building the first United States transcontinental phone line required fundamental innovations: for example, engineers created an amplifier for the electric signals to prevent them from ______ after a few miles.
- Apropagating
- Battenuating
- Cdissipating
- Diterating
- Edeviating
- Fbroadcasting
B,C显示答案
以上解析由 考满分老师提供。