準確地說衝量是一個瞬時值

來源: MoonRiverMe 於 2014-10-06 09:10:05 [舊帖] [給我悄悄話] 本文已被閱讀：次

是在t時刻F產生的衝量，因此才有dp=Fdt

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.