题目

已知平面单位向量 ， 满足 ， ，记 为向量 与 的夹角，则 的最小值是． 答案：【1】4320小题1:Calculate what p______ of your income you spend on food.小题2:Even slight rent increases would cause considerable h_____.小题3:As the wages were low, there were few a______ for the post.小题4:Scientists are hoping for a b_____ in the search for a cure for cancer.小题5:Your ticket is v_____ for travel at anytime of the day.小题6:Radio is an important communication _______(媒介) in many countries.小题7:Team members will be selected according to strict ______.(标准)小题8:I want to get a new passport but I don’t know the ______. (程序)小题9:At the ______(最初的) stage of the project not everyone had access to a computer.小题10: It is useful to have a ________(附近) supermarket.