某工人用如图所示的装置把一重为1200N的箱子从斜面底端匀速拉到顶端用时10秒，已知斜面长6m、高2m，此装置的机械效率为80%（滑轮重、绳重、滑轮与绳之间的摩擦均不计）．求：
用小正方体摆成一个大正方体，最少需要____个小正方体．
— It’s not good for parents to_________ other people. —I agree with you. Everyone has his own advantages.
A good many things in the world cannot be considered and valued ________ money.
