tortoise n. 龟, 乌龟; 例句 A tortoise has a shell on his back. 乌龟背上有硬壳。 The fate of many British designers calls to mind the fable of ...
乌龟的单词tortoise; 短语 African spurred tortoise 苏卡达陆龟 ; 苏卡达龟 ; radiated tortoise 射纹龟 ; 辐射陆龟 ; impressed tortoise 凹甲陆龟; El...
是的,可微一定可导。但是可导不一定可微。 可导的充要条件左导数和右导数都存在并且相等。 可微若函数在某点可微分,则函数在该点必连续;若二元函数在某点...