搜索 - 科创

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中文简介：一瓶消毒用500mL 99%异丙醇（有效期至2007年），长期在水槽下方暗处久置。2019年5月，瓶子翻倒，盖子破裂，内容物流出，瓶主发现其气味比正常要弱，且蒸发速度也比正常情况下要慢。20...

lz如何得到废气是亚音速的结论？理想废气速度计算方法在这里： Ve = 喷管出口排气速度， m/sT = 入口气体的热力学温度, KR = 通用气体常数 = 8314.5 J/...

本帖最后由虎哥于 2014-4-23 00:41 编辑语音进去是模拟的，然后被采样成数字信号，这个信号的码率比较大，不适合无线传输。然后对数字话音进行压缩，压到几K带宽。这样就能用无线传输...

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