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当前学科:M11涡轮发动机飞机的结构与系统
题目:
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HF通信系统的天线调谐耦合器是密封充压的,其目的是:().
A . 提高发射功率
B . 防外界潮气进入,降低抗电强度
C . 提高调谐速度
D . 提高作用距离
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