Fed std 209e和iso 14644是两种不同的标准,但它们都与洁净室相关。 fed std 209e是美国联邦标准,用于定义洁净室中空气中的颗粒数量。该标准对应于各种级别的洁净. Fob、cnf、cif的主要区别在于费用、责任和风险的承担方不同。 fob,全称free on board,即船上交货,习惯上称为离岸价。在fob术语下, 买方负责派船接运货物,.
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