原式=(5+4-45)-(5+4+45)
=5+4-45-5-4-45
=[5+(-5)]+[4+(-4)]+[(-45)+(-45)]
=-85.
As teenagers of the 21st century, we should be ready to _____ the challenge of society.
A.put
B.do
C.make
D.meet
错台的测量是用来评价路面______。
A.行车舒适性 B.整体强度 C.抗滑性 D.稳定性