对于声速测定仪中电子数显尺的常见故障原因进行了分析，并总结出维修方法。
Also it analysed the cause of the faults of the electronic displaying ruler in sound speed measuring unit.
不稳定性产生的可能机制是由于电子束穿过低密度本底等离子体的漂移速度超过离子声速而激发起来的。
It is suggested that the instability is excited in the low density plasma when the electron beam drift velocities exceed the ion acoustic speed.
还借助扫描电子显微镜（SEM）、 热分析（ DSC）、广角X射线衍射（ WAXD）、声速等手段研究了UHMWPE熔纺丝在超拉伸过程中结构性能的变化。
The changing of the structure and properties of UHMWPE fibres during super drawing were studied by means of SEM, DSC, WAXD and sound pulsimeter.
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