Answer
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Step 1: Understand the problem
The problem is asking for a term that must be present in cranes and derricks installed on floating surfaces.
Step 2: Identify the required term
For cranes and derricks installed on floating surfaces, a stability arm or "outrigger" is required. An outrigger is a structural component that provides support to the crane or derrick, preventing it from tipping over. It accomplishes this by spreading the load over a larger area, increasing the stability of the structure.
Final Answer
Cranes and derricks installed on floating surfaces must have an outrigger (stability arm).
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