However, ultrasonic checks showed cracks in the seams. 但是超聲波檢查，表明焊縫還有裂紋。
Ultrasound examination for oligohydramnios is useful to confirm the diagnosis but oligohydramnios may be caused by other disorders besides PROM. 超聲檢查提示羊水過少也可以證實胎膜早破的診斷，但除胎膜早破外其它因素也可以致羊水過少。
It is also desirable to have a reasonably fine grain in order to obtain ultrasonic inspectability. 為了獲得良好的超聲波探傷性能，也希望得到合適的細晶粒。
This paper deduces the errors sources from the process of ultrasonic longitudinal wave testing and evaluates its uncertainty. 本文分析了超聲波探傷縱波檢測的誤差來源，評定了在探傷過程中的不確定度。
