题型:问答题 简答题 一轻绳上端固定,下端连一质量为0.05kg的小球,若小球摆动过程中轻绳偏离竖直线的最大角度为60°,则小球经过最低点时绳中张力等于________N。(g=10m/s2) 查看答案
题型:问答题 简答题 .I have told her never to write to me again afterwards . You______be sorry for what you said to her .A.needB. shallC.have toD.ought to 查看答案