【单选题】下列选项中,哪个不是正弦量的三要素( )。
【单选题】治疗肿胀的手法在操作时一定要保持与( )
【简答题】It has been proved that the geodesic dome is ______ human shelter.
【单选题】It has been proved________violence on television has a bad effect on the development of children. [ ]
【单选题】It has been proved _______ violence on television has a bad effect on children.