题目内容：
根据下列选项，回答题。1 rates are applicable to any type of commodity，without the restriction of hazardous consignment size．On some routes，minimum charges apply at higher weights of up to 2 ．There is considerable justification for the minimum charge principle，because the costs of documentation and customs clearance are fixed irrespective of consignment size and small consignments are expensive to handle． 3 Rates are a further supplement to the General Gargo Rate tariff，and are applied by most airlines．Under this Rating，certain commodities are offered a discount，and many more commodities are surcharged under class ratings． 4 Rates are rates that are applicable to named types of freight．In addition， they have a number of features that separate them as a distinct form of pricing.
5 Rates offer low unit rates，substantially below comparable General Gargo Rates．They are available for all types of freight，irrespective of commodity type.
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