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中国古代延请塾师、聘请幕僚或拜师学艺所订立的约定。又称关约、关聘、关帖。
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optical pair
optical parallelism
optical parameter
optical parametric amplification
optical parametric amplification and oscillation
optical parametric amplifier
optical parametric oscillation
optical parametric oscillator
optical parametric oscillator, OPO
optical particle counter
optical particle counters
optical particle measurement
optical path
optical path difference
optical-path-difference aberration curves
optical path length
optical path length equalizer
optical pen
optical performance measurement
optical phase
optical phase conjugation
optical phase control technology
optical phase encryption
optical phase lock loop
optical phonon
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