校服秋装每套58元,冬装每套82元.四甲班共有学生30名,每人各订一套秋装和冬装,共需多少钱?
(58+82)×30
=140×30,
=4200(元),
答:共需要4200元.
简述厂内车辆伤害事故的主要原因?
The swimming pool is so()that it's safe for small children.
A.stable
B.smooth
C.superficial
D.shallow