If you want a____(永久的)job,you will have to be devoted to improving your skills.
下列四位物理学家中,其名字被用作功率的单位的是( )
(x﹣2y)2﹣(﹣x﹣2y)(﹣x+2y)÷(﹣4y),其中x和y的取值满足 x2−2x+1 +(x2+4xy+4y2)=0.