1)effective f-number,有效f数，有效光圈2)number of active coils,有效圈数3)effective f-number,[摄]有效光圈数4)f-efficient solution,f-有效解5)Aperture,光圈,有效孔径6)effective luminous efficacy,有效光效
用法和例句
It presentd the necessary and sufficient conditions for-efficient solution pair,and strong solution pair without the ordering cone having the nonempty interior.