active adj. 1.活动的,有活动力的;【生物学】活性的;【电学】有功的;【无线电】有源的;【物理学】放射性的。 2.有生气的,活泼的,灵敏的,敏捷的;主动的,能动的,积极的;有力的,勤勉的;【医学】有特效的。 3.现行的,活动中的;【军事】现役的。 an active demand 畅销。 an active volcano 活火山。 The market is active. 市场活跃。 active measures 积极手段。 on active service 【军事】现役,现役中的。 take an active part [interest] in 积极参加。 adv. -ly 活跃地;积极地,能动地;【语法】主动地。 n. -ness 活跃,积极性。
be active in 对…很积极; 活跃于; 积极参加; 积极于; 在......里活跃; 在……活跃
Adults will visit flowers , mating and find hostplant aristolochia kaempferi after eclosion . the active time of adults is from 9 : 00 a . m . to 18 : 00 p . m . , 雌蝶羽化后就近访花、交尾,寻找寄主植物马兜铃产卵、雌虫孕卵量为18 - 20粒;飞行缓慢,反应迟钝,相对容易捕捉。
3 . passive and active time - domain demodulation schemes were demonstrated based on a fiber bragg grating used as a tunable filter controlled by a piezoelectric stack , which was driven by an electrical sine wave signal . the measured strain applied on the sensor axially could be judged by observing the interval of the output between notches within a driving period in time - domain 利用匹配滤波技术,分别采用无源和有源方式,借助受pzt驱动的解调光栅,将待测应变信息变为时序负脉冲间隔的变化,利用常规的示波器观测同一扫描周期中两负脉冲在时域中间隔的变化来确定待测应变的变化。