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。
2
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.
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.