人耳听到的声音频率范围是(  )Hz。

人耳听到的声音频率范围是(  )Hz。

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有关天然采光的描述正确的是(  )。

有关天然采光的描述正确的是(  )。

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It was not until the War with Russia that Nightingale

It was not until the War with Russia that Nightingale

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When the boy and the young woman met again years later

When the boy and the young woman met again years later

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