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1·There existed three met hods for fault location : impedance method, fault analysis method and traveling wavemet hod .

精确故障定位的传输线是非常重要的电力系统。 故障定位有三个方法：阻抗法、故障分析法和行波法。

2·Statewide unemployment, at 10.2%, has trebled since then, as bricklayers lay down their hods and tour guides doff their Mickey masks.

而州平均失业率，随着砖瓦匠放下他们的浆桶，旅游向导脱下他们的米奇面罩，也自06年上窜3倍达到10.2%。