分解因式:a3-2a2b+ab2=______.
a3-2a2b+ab2,
=a(a2-2ab+b2),
=a(a-b)2.
The boy was sad to find the gold fish he ________ died yesterday. [ ]
A. looked for
B. looked after
C. took for
D. took after
电气测量又称为电磁测量,但是不属于电测量范围的是( )。
A.电感
B.电流
C.磁导率
D.功率