红旗印刷厂要装订680本练习本,装订了5天,还剩105本没装订,这5天平均每天装订多少本?
(680-105)÷5
=575÷5,
=115(本).
答:平均每天装订115本.
Investment by Chinese companies in the US _____ rapidly in recent years.
A.was growing
B.has been growing
C.had grown
D.will be growing
矿山机械中常用液压马达有()、()、()。