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单选题
The units or components which give visual or aural warning of conditions in unrelated systems. Units which record, store, or compute data from unrelated systems.
A
The units or components which are used to give conditions warning visually and aurally in separate systems. Also, there are other units which are used to record, reserve, or compute data from separate systems.
B
The units or components which give visual or unusual warning on irrelevant system conditions. They are also used to record, store, or computerize various sources of information from diverse systems.
C
The units or components which help people get warning information through sighting and touching about different systems conditions. Other units which help people input, reserve, or calculate data in different systems.
答案解析
正确答案：A
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