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[中考物理真题] 2014年四川省达州市中考理综(物理)真题试卷附答案
9、下列有关声现象说法正确的是( )A、中考期间考场附近禁止鸣笛,是在声源处消声来控制噪声的B、“声纹门锁”是依据声音的响度来识别的C、声音的传播速度是340m/sD、我们可以利用回声来测量地球与月球之间的距离2014-07-04 编辑:max
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Filename: libraries/Cache_file.php
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Severity: Warning
Message: Memcache::connect(): Can't connect to 127.0.0.1:11211, Connection refused (111)
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2014-07-04 编辑:max