(接上期)现代钢琴的弦列产生的十数吨拉力使铁板的使用成为必需。铁板通过螺栓与钢琴的背架相连。在铁板应力汇集的地方,中音—次高音分档处、次高音—高音分档处和中音—低音分档处,设有铁板的铁筋。音板所承受的弦列施加给它的巨大的压力从铁筋处向两侧递减。在外壳支撑力的作用下,音板受 (Continued) Ten tons of tension generated by the strings of modern pianos make the use of iron plates necessary. The iron plate is connected to the back frame of the piano by bolts. In the iron stress concentration place, the tenor - sub-treble sub-file, sub-treble - treble sub-file and alto - bass sub-file, with iron iron. The tremendous pressure exerted on it by the chord of the soundboard diminishes from the tendons to both sides. In the case of the supporting force, the soundboard by