Self - assembly box designed to hold a single reel of magnetic tape and small documents 自行可封的盒子，专为放置磁带小型文件等而设计。
3.
The article describes mechanics and features of this twisting frame with single reel and five rollers and double drafting system with its drafting form compared with other double drafting system and some typical fancy yarns introduced 摘要阐述了单摇架五罗拉双牵伸机构的机理和机器特点，叙述了与其他双牵伸形式的不同点，介绍了几种典型花式纱线。
