... simultaneous technique 同时联用技术；同时并用技术 sing around method 声环法 sing-around velocimeter 环鸣声速仪 ...
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In the first part of this paper, the principle and the error analysis of our ultrasonic velocimeter are presented, and a comparison with the "Sing Around velocimeter" is given.
本文第一章介绍我们的超声波声速仪的原理和误差分析，并给出它和回呜法的比较。
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