—There will be more and more robots going into people's homes.
— . We might be able to leave all the chores to them.
A:Not really
B:No way
C:You're kidding
D:I hope so
计算:26﹣(﹣15).
电冰箱工作时,能把箱内的热传到箱外,这____(选“违反”或“不违反”)热力学第二定律.
下图中这个面带喜悦的农民,肩膀上扛着一个地界牌,上面写着:贫农王贵元分到十一亩田地。这个情景说明当时中国实行的是( )
不等式选讲:已知x,y,z∈R,且x﹣2y﹣3z=4,求x2+y2+z2的最小值.