A sound impulse emitted by the tool at the surface reflects tubular collar reflectors and the liquid surface.
仪器发射的声波脉冲在套管接箍和液面位置发生发射。
Including the principles and the source design, a method of digitally-controlled sound impulse generator is introduced.
研究了一种可控脉冲声生成技术，介绍了声源设计方案以及脉冲声工作生成的主要原理。
On impulse he picked up the phone, thinking to call Alex, his old boss, and sound him out, but the line was down, too.
他一时心血来潮，抓起电话，想给他以前的老板亚历克斯打电话试探一下。可是，电话线也断了。
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