A:do nothing but slee
B:do anything but slee
C:do nothing but to slee
D:do anything but to slee
式子a2x>x(a2+1)成立,则x满足的条件是____ .
如图所示的四幅图是小新提包回家的情景,小新提包的力不做功的是( )
一体积为0.1×10﹣3米3的物体完全浸没在水中,求它所受到的浮力.