设曲线 L:f(x,y)=1(f(x,y) 具有一阶连续偏导数 ) ，过第II 象限内的点M和第IV象限内的点N，T为L上从点M到点N的一段弧，则下列小于零的是（）
西汉时，主张文治，反对 "马上治天下 "的是 ()
Matter is the name ________ (give) to everything which has weight and occupies space.
I bought this eighteenth century writing desk at a quite ________ price.
________ from the occasional late night party, our neighbors are very quiet.
,则 D绕y轴旋转所成旋转体体积为_____
