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ARC-Challenge / MCAS_2004_9_15-v1 / Which of the following is the primary difference between hydraulic and pneumatic…

Problem

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question

Which of the following is the primary difference between hydraulic and pneumatic systems?

choices

Hydraulic systems are under pressure and pneumatic systems are not.
Hydraulic systems involve liquids and pneumatic systems involve gases.
Hydraulic systems are open systems and pneumatic systems are closed systems.
Hydraulic systems involve fluids in motion and pneumatic systems involve fluids at rest.

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Source and history

upstream_id / Original problem ID: MCAS_2004_9_15-v1
task_id: d46bbe60-7615-5416-b2d4-a46b19aaf620
task_key: ARC~2dChallenge--test--MCAS~5f2004~5f9~5f15~2dv1
task_revision_id: 2
config / split: ARC-Challenge / test

Official source

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