首端是汉语词语，拼音是shǒu duān，意思是开端；开始。
分析表明，线路末端三相故障时，线路首端的测量阻抗不与故障距离成正比。
The analysis shows that the measured impedance at the head of the line is not proportional to the fault distance when a three-phase fault occurs at the end of the line.
清单11首先创建了一个新的客户端类。
本系列产品适合安装于通信局站传输设备机房机列的端首，为通信设备进行直流电源分配和故障告警指示；
The series fit to be installed at the start of the equipment row in the transmission equipment center of communication stations.
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