尽管早期对塑料电缆寄予希望，但对于较高电压，最有效的绝缘仍采用油纸组合绝缘。
In spite of earlier hopes for plastic insulations, the combination of paper and oil still forms the most effective dielectric at the higher voltages.
尽管早期对塑料电缆寄予希望，但对于较高电压，最有效的绝缘仍采用油纸组合绝缘。
In spite of earlier hopes for plastic insulations, the combination of paper and oil still forms the most effective dielectric at the higher voltages.
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