1. The DC and AC attenuator circuits provide ranging for the AC and DC functions. 直流和交流衰减器电路提供直流和交流功能的量程切换。
2. This paper introduces an ultrasonic ranging method based on analyzing the envelope of echo . 介绍了一种基于回波包络分析的高精度超声波测距方法。
3. When such swells hit the coast, however, part of their energy is transformed into vibrations that have periods ranging from 50 to 350 seconds. 然而,当这样的海洋膨胀撞击到海岸上时,其部分能量将会转换为周期为50秒~350秒的波浪的震动。