一个长方形操场,长120米,比宽长40米,这个操场的周长是多少米?
120-40=80(米),
(120+80)×2=400(米).
答:这个操场的周长是400米.
. --- Do you mind if I open the window ? It’s hot in here.
--- ______________________
A.Do you want to have a go ?
B.Not at all.
C.Hot weather, isn’t it ?
D.Leave me alone.
脓肿最常见的致病菌是()
A.溶血性链球菌
B.志贺菌
C.白色葡萄球菌
D.金黄色葡萄球菌
E.草绿色链球菌