指出了一般用伏安法测二极管特性曲线一实验中存在的问题，同时给出其改进方法及在实验中应注意的问题。
This paper points out the problems existed in the experiment to test the characteristic curve of diode by voltammetry, and presents a method to improve the experiment.
研究传统法和根测仪法确定根管工作长度后行根管充填的效果，评价两者的准确性和优缺点。
To study the effect of root canal filling after confirm the canal working length by using traditional method and endometer method, and to evaluate their veracity, advantages and disadvantages.
声测管是灌注桩实行超声检测法时探头进到桩身外部的通道。
Acoustics detection ultrasound screening pile pipe is execute when the probe into the pile body external channel.
声测管是灌注桩实行超声检测法时探头进到桩身外部的通道。
Acoustics detection ultrasound screening pile pipe is execute when the probe into the pile body external channel.
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