2、at all cost表示“不惜任何代价,无论如何”,它的用法比at any cost更为普遍;cost原属于 不及物动词,但是为了方便,不出现及物动词加 间接宾语 再加状语宾语的特殊. 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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