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题目内容双击单词支持查询和收藏哦～
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.
- A.propagating
- B.attenuating
- C.dissipating
- D.iterating
- E.deviating
- F.broadcasting
B,C显示答案
以上解析由 考满分老师提供。
