Article 6 Customs import duty shall be calculated in accordance with general tariff rates and preferential tariff rates.

第六条进口关税设普通税率和优惠税率。

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When they had rung in with correct meter readings after receiving estimated bills, EDF's automated system had charged all the additional units - if there were any - at its higher tariff rates following a general price rise.

BBC: Ofgem demands billing explanation from energy suppliers