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According to the form and packaging of goods、 the maritime transport goods are divided into three categories: liquid goods、 dry bulk goods and general cargo. The three categories of goods are divided as follows:
① Liquid cargo: petroleum、 product oil、 liquefied gas、 liquid chemicals and other liquid cargo.
② Dry bulk cargo: various primary products and raw materials. Generally、 dry bulk cargo can be divided into bulk cargo and small bulk cargo according to the size of transportation batch. Bulk cargo mainly includes coal、 metal ore、 grain、 etc; Small batch bulk cargo includes steel、 wood、 fertilizer、 cement、 etc.
③ General cargo: mainly including electromechanical equipment、 chemical industry、 light industry medicine and other industrial finished products、 agricultural、 animal husbandry and fishery products. These goods are generally consigned in the form of "pieces"、 "boxes" and "bundles"、 including packaged goods、 unpacked goods or non packaged goods、 and unitized goods.
Air transport means ordinary air transport. When transporting large quantities of goods、 the general freight will be cheaper than express delivery. However、 they need to deliver the goods themselves、 declare customs and even apply for inspection. It may also inspect the goods.
Express delivery is not necessarily air transportation. If it is international transportation、 the delivery time in some places is not necessarily faster than ordinary air transportation. But usually、 there is no need for customs declaration and inspection、 and it is convenient to pick up and deliver goods at home.
