Percentage of net ton kilometres to gross ton kilometres 这艘船的吨位是2万吨。净重吨公里对总重吨公里百分率
At present, when carries on the charge to the ship which is going floodgate in domestic canal, usually takes gross tons as charge basis. Shipping ton checking is based on artificial scene ship survey and the tonnage provided by the navigation book. 目前国内运河在对过闸船舶收费时,以总吨位为收费依据,对船舶吨位的核定是以人工测量和参照航行簿提供的吨位为依据。