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	<title>骆驼调频 &#187; 短波</title>
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		<title>中波,短波,调频收音机的干扰因素</title>
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		<pubDate>Sun, 25 Nov 2007 14:59:33 +0000</pubDate>
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		<category><![CDATA[调频]]></category>

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		<description><![CDATA[　　中波：中波的传播主要受电离层的影响，夜间收到的中波电台会比白天多。这是由于电离层导电性能在白天和夜间的不同变化引起的。白天，由于阳光照射，电离层密度增大，导电性能增... ]]></description>
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