因此，对盘形悬式绝缘子直流覆冰试验方法进行研究，对直流覆冰输电线路外绝缘特性的研究具有重大的意义。
Therefore, it has great significance to research DC icing test methods on disk-shaped suspension insulator for study of DC transmission line characteristics of external insulation.
冰 空悬了一会儿，然后哗啦掉了下来。
Masses of ice are poised at one moment and the next come crashing down.
冰 空悬了一会儿，然后哗啦掉了下来。
Masses of ice are poised at one moment and the next come crashing down.
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