由长方形的周长公式可得,长方形的周长=(长+宽)×2.
故选B.
Those poor and needy teenagers were excited to find a shop at the corner where they could buy ____ priced bikes.
A.competitively
B.recently
C.reasonably
D.affordably
流行性出血热早期休克的主要原因是()
A.小血管通透性增加,血浆外渗,血容量锐减
B.播散性血管内凝血
C.心肌损害
D.肾功能不全,水、电解质平衡失调
E.肠道大出血或继发感染