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当前学科：移动通信网
题目：
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在移动通信中，接收机必须采用（）克服多普勒效应产生的影响。
A . A、锁相技术
B . B、自动增益调节技术
C . C、多址技术
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在空载覆盖拉远测试中，发现在掉话点无法重新接入，要回退一段距离才能接入，即掉话距离比接入距离远，请问产生这种现象的原因有哪些，可如何改善？
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