【单选题】● 下列不属于著作权保护的是(63) 。 (63)
【单选题】He looked rather untidy as there were two buttons _____ from his coat.
【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。
【单选题】It was surprising that the hotel looked rather shabby outside was luxuriously and ______ furnished inside.
【单选题】It was surprising that the hotel that looked rather shabby outside was luxuriously and ______furnished inside.
【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: