Application of the super capacitor and the mini manual electrical generator in the hand-held digital display railway track scale;
超级电容和微型手摇发电机在手持式数显轨道测量尺中的应用
The designation of manual-folding transferring implement;
手摇式折叠式过床器的设计
Cell phone uses three fashions of oral message,hand telephone,cell phone as its clue.
《手机》以三种通讯方式———捎口信、手摇电话、多功能手机为线索,典型而又深刻地反映了20世纪初期、中期、晚期三个时期时代变迁。