从（）看，我们大力发展社会主义民主政治，人民当家作主权利得到保障。 ["政治建设","经济建设","文化建设","社会建设"]
简述生物群落的演替特征。
Which two multicast IP addresses can be represented by the multicast MAC addre ss 0100.5e0A.0A07?（） [" 228.10.10.7"," 229.11.10.7"," 229.138.10.7"," 229.138.10.8"," 228.10.10.8"," 228.10.138.7"]
给水管道一次试压管段长度一般不超过（）。 ["A.500m ","B.800m ","C.1000m ","D.1200m"]
简述皮肤散热方式有哪些？
焊缝
