【单选题】He looked rather untidy as there were two buttons _____ from his coat.
【简答题】random模块中_____________函数的作用是将列表中的元素随机乱序。
【单选题】Bill looked rather _______ when the professor asked him a question which he didn't know how to answer.
【判断题】Internet(因特网)上最基本的通信协议是TCP/IP。
【简答题】He looked rather untidy as there were two buttons _____ from his coat. A. loosing B. losing C. off D. missing
【判断题】中职生不应把职业单纯地看成是谋求生存的手段,而应把职业视为一生追求的事业。
【简答题】已知边长为a的等边三角形内任意一点到三边距离之和为定值,这个定值为 ,推广到空间,棱长为a的正四面体内任意一点到各个面的距离之和也为定值,则这个定值为:
【单选题】.设 为两个非零向量 、 的夹角,已知对任意实数 , 的最小值为1( )