题目内容：
According to this passage, which is not true about the construction of the robotic caterpillar?
A．A robotic caterpillar is made from a series of rubber capsules tilled with a magnetic flui B．Iron particles, water, and a detergent-like surfactant form a magnetic flui
C．Each capsule filled with a magnetic fluid is linked to the next by a pair of rubber rod
D．In order to keep stable condition, the caterpillar' s guts are wrapped in a clear, flexible polymer tub
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