一个长方形花坛,宽是15米,长是宽的2倍,沿花坛走3圈是多少米?
(15×2+15)×2×3
=45×6
=270(米)
答:沿花坛走3圈是270米.
162. Many countries are increasing their use of natural gas, wind and other forms of ______.
A.energy
B.source
C.power
D.Material
眼睑裂伤缝合时应注意()
A.顺皮肤纹理缝合
B.注意睑板、韧带、滑车、眶骨等是否损伤
C.注意有无泪道损伤
D.注意是否合并球内损伤
E.以上都对