The tailless delta-canard configuration is inherently aerodynamically unstable, which provides a high level of agility, particularly at supersonic speeds.

鸭式无尾翼布局具有高度机动性和优越的超音速性能，但亦具有先天空气动力上之不稳定性。

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The paper introduces not touching single supersonic probe level measurement theory of operation, describes sort of factors that influences on measurement and install claim.

本文介绍非接触或单探头超声波物位检测仪的原理，分析影响检测仪正常使用的因素及其安装要求。

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