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单选题

Those units or components give visual or aural warning of conditions in unrelated systems.

A The parts or components provide visual or auditory warnings in unconcerned systems.

B Those assemblies or components provide visual or aural warning in irrelevant systems.

C Visual or aural warning of conditions in irrelevant systems are supplied by those units or components.

正确答案:A (备注:此答案有误)

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