[填空题]
The volume V of a cube increa7enw)78owvuu ;y6w+gwb ,mww o 78chsses atyk4zx1w 1 s9fcv0ndh) a rate of $4 \mathrm{~cm}^{3} \mathrm{sec}^{-1} $. Find the rate of change of the surface area of the cube, with respect to time t , at the instant when the volume of the cube is $8 \mathrm{~cm}^{3}$ .
the surface area is increasing at a rate of $\mathrm{~cm}^{2} / \mathrm{sec}$
