食品抽检由食品生产经营者无偿提供被抽检的食品。
错误
暂无解析
________fromtheoccasionallatenightparty,ourneighborsareveryquiet.
设y=y(x)是由方程所确定的隐函数,则 .=
________(catch)intherain,hewaswettotheskin.
It________asashocktorealizethatIwasnotaloneintheroom.
设曲线y=ax^2+2x在点(1,a+2)处的切线与直线y=4x平行,则a=()