2x2-8=( )
2(x-1)(x+2)
在一圆管管壁上钻孔,圆孔的轴线与圆管的轴线垂直相交,则圆管内壁的相贯线与圆管外壁的相贯线相比()
A.弯曲程度较大
B.弯曲程度相同
C.弯曲程度较小
D.以上均不正确
It’s impolite angry your parents.
A.Is; to
B.to be ; with
C. are; at
D.to be; about