兑水 发表于 2009-11-7 09:07:02

ASTM E 1544-1999 阶梯形砌块的结构和固体用声速测量系统对...

E1544-99(2004)e1 Standard Practice for Construction of a Stepped Block and Its Use to Estimate Errors Produced by Speed-of-Sound Measurement Systems for Use on Solids
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