一、东风71型半导体测深仪测深仪是航道测量人员必不可少的工具。无产阶级文化大革命以前,这些仪器是使用进口的电子管的,费电而且笨重,生产效率低,劳动强度大,不能用于码头等浅水区测量。无产阶级文化大革命中,上海航道局航测大队工人,遵照伟大领袖毛主席“独立自主,自力更生”的教导,奋发图强,勇于创造,用晶体管来代替电子管,经过反 First, the Dongfeng 71 semiconductor sounder sounder is an indispensable tool for waterway surveyors. Before the Great Proletarian Cultural Revolution, these instruments used imported tubes, which were expensive and bulky, had low productivity and were labor-intensive and could not be used for measuring shallow water areas such as wharves. During the Great Proletarian Cultural Revolution, the crew of the aerial survey team of the Shanghai Waterway Bureau followed the teachings of Chairman Mao, “Great independence, self-reliance,” and worked hard to create and use transistors instead of electronic tubes.