Customs Code Inquiry:

https://www.hscode.net/IntegrateQueries/QueryYS
https://hts.usitc.gov/
https://www.trade-tariff.service.gov.uk/trade-tariff/headings/8525?day=21&month=2&year=2018

Track a Package:
https://www.17track.net/zh-cn


Fuel Rate Inquiry:

DHL
http://www.cn.dhl.com/zh/express/shipping/shipping_advice/express_fuel_surcharge_apem.html
 
UPS
https://www.ups.com/cn/zh/shipping/surcharges/fuel-surcharges.page