弧光中的紫外线可造成对人眼睛的伤害，引起
ABDE
暂无解析
一质点在xy平面内运动，运动方程为r=2ti+(3t2+2)j，则该质点的运动轨迹是()
异性同学之间没有真正的友谊
Goodparentshavetheabilitytocommunicatemessagesoflove,trust,andself-worth______theirchildren
We_____knowledgefromourfamilies,schools,jobs,andthemassmedia
Decisiononwhetherthemessageisrightorwrongshouldatleastcomeafter_____whatthemessageis.