In the course of construction, the free pore water in the weak soil of highway foundation is seldom discharged immediately, and the excess pore water pressure comes into being.
软土高填方路基施工过程中，土内自由水难以及时排出，产生超静水压力。
This paper describes the principle, construction and experimental results of the standard apparatus for underwater sound pressure by using the free-field reciprocity method.
本文叙述自由场互易法水声声压标准装置的原理、组成和实验结果。
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