用适当的方法解一元二次方程:(x-2)2=(2x+3)2
-5
The little boy made a mistake, so his mother ____ him to leave the house as a punishment. [ ]
A. forbade
B. hoped
C. prevented
D. persuaded
下列氧化还原反应中,()描述正确。NH3+O2一→NO+H20
A.N化合价降低
B.H化合价降低
C.H化合价升高
D.O化合价降低