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声波探测仪
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声波探测仪
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sonic detector
声波探测仪
通过向岩体、岩石、混凝土等发射声脉冲,接收声场经介质传播的声波信号,并分析介质的时间、能量、频率等声波变化的观测仪器。
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primitive period
primitive period parallelogram
primitive permutation group
primitive polynomial
primitive polytope
primitive porcelain
Primitive Porcelain of Yinxu
primitive prime factor
primitive proposition
primitive pseudogroup
primitive pseudoperfect number
primitive Pythagorean triple
primitive quadratic form
primitive recursion
primitive recursive arithmetic
primitive recursive attribute
primitive recursive description
primitive recursive function
primitive recursive isomorphism
primitive recursiveness
primitive recursive operation
primitive recursive predicate
primitive recursive relation
primitive recursive scheme
primitive recursive set
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