comparator

comparator
[kəmˈparətə]
noun
  1. a device for comparing a measurable property or thing with a reference or standard
    比较仪
    ■an electronic circuit for comparing two electrical signals
    比较电路
    ■something used as a standard for comparison
    比较标准;对照物
语源
  1. late 19th cent.: from Latin comparat- 'paired, matched', from the verb comparare (see compare), + -or
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