四大快递：
DHL燃油费：http://www.cn.dhl.com/zh/express/shipping/shipping_advice/express_fuel_surcharge_apem.html
FEDEX燃油费：http://www.fedex.com/cn/rates/dfs.html
TNT燃油费：https://www.tnt.com/express/zh_cn/site/home/how-to-ship-parcel/invoices-and-surcharges/surcharge.html
UPS燃油费：https://www.ups.com/content/cn/zh/shipping/cost/zones/fuel_surcharge.html
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