Concrete was chosen for the construction of the load-bearing structure of the whole, due to its thermal and acoustic qualities and cost-effectiveness.

选择混凝土结构作为承载结构，是由于其热和声学品质以及成本效益。

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Tracking target by using anti-helicopter mine (AHM) is actually the bearing-only measurement because precision of range detected by passive acoustic measurement cant satisfy the need of tracking.

目前被动声探测距离精度还不能满足跟踪的需要，因此，反直升机智能雷对目标的跟踪问题归结为仅有角测量的跟踪问题。

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For sandstone reservoir, the acoustic impedance of gas-bearing sandstone is lower than that of oil - and water-bearing sandstone, gas in reservoir may be directly recognized by using this difference.

对于砂岩储层，含气砂岩的声阻抗比含油和含水砂岩的声阻抗低，利用这种差异可以直接识别储层中气体。

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