题目内容：
Comparing the robotic caterpillar and the other robots, which of the following is not true?
A．A smooth surface is indispensable to biped robots and wheeled robot B．Flying robots are very inconvenient when moving, because they have too many moving part
C．The robotic caterpillar only has robber capsules filled with a magnetic flui
D．It' s incapable for wheeled robots to locate trapped people because they are impossible to miniaturiz
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