Перепишите предложения, подчеркнув в каждом из них глагол – сказуемое и определите его видо-временную форму и залог. 1. As copper is a good conductor we were recommended to use it when we were carrying on our research work.
2. When the insulator is covered with a thin film of conducting electrolyte, a leakage current flows to ground over the insulator surface and this gives rise to heating.

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