A:to persuade out of
B:persuading out of
C:being persuaded into
D:be persuaded into
青少年避免受到侵害的前提是( )
如图所示,半径为1的圆心角为60°的扇形纸片OAB在直线L上向右做无滑动的滚动.且滚动至扇形O′A′B′处,则顶点O所经过的路线总长是____
潜水艇在水面下继续向深水处下潜的过程中,所受浮力和压强( )