【简答题】Fill in each blank with an appropriate phrase given below, changing the form if necessary. leap out cut off work out result in in answer to be intended to tak...
【简答题】When an big earthquake hit Wenchuan on May 12 , many houses fell down. After the earthquake , all the newspapers reported many stories about some of the families who were in trouble. One Sunday , when...
【简答题】某组合机构的传动简图如 图所示。件 1 、件 2 构成标准直齿圆柱齿轮传动, i 12 =2 , w 1 = rad / s ;件 3 、件 4 构成对心凸轮机构;件 3 是半径 r=90mm ,几何中心为 O 的圆盘;件 3 与件 1 同轴并绕 A 等速转动, L OA =20mm ;件 4 上的滚子半 r T =10mm ;件 5 和件 2 用铰链在 C 点连接,并绕 B 等速转动; L BC...