Iran was _____ by the army because of his bad eyesight.
A:refused
B:declined
C:rejected
D:deny
在下列有关晶体的叙述错误的是( )
分解因式与整式乘法一样,都是一种恒等变形,即在变形的过程中,形变值不变,于是将多项式x2﹣y2+3x﹣3y分解因式的结果为( )