Study on the drainage time and the flow coefficient in the experiment of the flow velocity of small holes
HUANG Yu-hong, ZHANG Suo-bin, WEI Fen-fen, ZHANG Zong-quan, HOU Yun-bo
College Physics . 2020, (04): 28 -33 .  DOI: 10.16854 / j.cnki.1000-0712.190271