A. The high value B. Low density or weight C. A and B D. To add cost
A.自动引导车 B.自动导向车 C.自动行走车 D.自动运行车
A.Inspection B.Examination C.Control D.Test
A.Internal functions B.External functions C.Information systems D.Physical distribution
A. Around the city B. City itself C. The area near the city D. Big city and its neighbor area
