Wednesday, February 7, 2024
Wednesday, February 7, 2024
问题:为什么用普朗特数Pr可以定性地判断流体外掠平板时的速度边界层和温度边界层的相对厚度?
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
问题:在太阳能利用中,太阳灶的受热面要做成黑色表面,而在室内供热用的辐射采暖板却不必做成黑色的,为什么?
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Saturday, January 20, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
Wednesday, February 7, 2024
问题:空气的气体常数Rg=287J/(kg⋅K),温度t=17℃,则空气中音速a为()。
Tuesday, January 23, 2024