闸门安装完成之后,应在( )条件下进行全行程启闭试验。
A
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设f(x,y)具有一阶偏导数,且对任意的(x,y),
Hethoroughlyunderstoodthesociety__________.
Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).
Theterriblenoiseis______memad.
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=()