freq. abbr. 经常的(frequent);频繁(frequency);表示反复的(frequentative);经常地(frequently)
- By varying VR1 you can set how fast the siren changes from high freq. to low fred.
通过改变VR1你可以设置多快从高频率警报的变化。低频率。 - Each group of ink forme roller equipped with individual AC motor freq. converter drive with easy control, flexible operation.
每组印刷着墨辊采用单独电机控制,控制简单、操作灵活。 - Donor maize plants grown in the fields was used as experimental materials, study of technique optimization was made mainly for improving freq. of microspore survival and ELS formation.
以大田种植的玉米供体植株为实验材料,以提高游离小孢子存活率及成胚率为重点进行了技术优化研究。