题目

如图用两道绳子捆扎着三瓶直径均为的酱油瓶，若不计绳子接头（取3），则捆绳总长为            ．  答案：96cm解析:一道绳子为两部分来计算。其中3条半径为4的120°的弧所以为一个圆周。而另一部分为3条相等的线段，因为圆与圆之间为相切关系所以3条线段的长度为8。所以一道绳子的长度为：2R+3*8=3*8+24=48，r所以两道为48*2=96。  There ________ a wonderful movie on show this weekend．Would you like to go with me? [　　] A． is going to have B． is going to be C． is going to has