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，. Cost，spend，take用法区别 这三个均可表示“花费”，但在用法和搭配等有很大区别。现分述如下： 一、从所涉及的主语来看 cost的主语通常是事或物（包括 形式主语 it），不. Sec、csc、cot的三角函数公式是secx=1/ (cosx)、cscx=1/ (sinx)、cotx=1/ (tanx)= (cosx)/ (sinx)。三角函数是基本初等函数之一，是以角度为自变量，角度对应任意角终边与单位圆交点坐标或.
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