Goodparentshavetheabilitytocommunicatemessagesoflove,trust,andself-worth______theirchildren
作用力与反作用力大小相等,方向相反,作用在一条直线上.作用力与反作用力的性质必定()
Ithoughtherrequestforfinancialaidwas___(reason),butsomehowitwasrefused.
Ifyouhavetheright___(equip),youwon’tfindthejobdifficult.
质量m=2kg的质点沿x轴运动,运动方程为x=0.5t2(SI),从t=0s到t=3s过程中,外力对质点做功为()