When shoes slide across a floor, wave-like deformations of the sole can generate squeaking. The pitch of the squeak depends on the rate at which deformations are generated.
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Eileen Collins made history as the first woman to pilot and command a Nasa spacecraft - but despite her remarkable achievements, not everyone will know her name.。业内人士推荐WPS下载最新地址作为进阶阅读
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（二）明知住宿人员是犯罪嫌疑人员或者被公安机关通缉的人员，不向公安机关报告的；