四个数复式三中三多少组

简介：The prototype is a small wooden machine used to weave silk in southern China. It is called a silk winding machine. It has a wooden handle and winds silk while shaking it. It is recorded in Song Yingxing's Tiangong Creations. Song Yingxing slightly modified it and made it from wooden It is made of iron and is very suitable for winding springs.