1.基本假設(shè):沖擊波是球面波,爆炸中心是該球面波的球心 數(shù)據(jù):爆炸火球半徑R的時序照片R(t) 量綱分析: (1) 相關(guān)物理量:能量E,時間t,介質(zhì)密度D,火球半徑R (2) 基本單位: (a) L 長度量綱 (b) T 時間量綱 (c) M 質(zhì)量量綱 (3) 量綱列表: (a) [R] = L (b) [E] = ML^2/T^...
2.I watched “Before Sunrise” first, then “Before Sunset”. I loved “before sunset”, the sequel made nine years later, better. It’s probably because of my age, I found more relevance to the second movie. “Before sunrise” is story of 20 somethings. You ...