when a rainy day is converted into a sunny day, the double groove pulley is rotated;
当雨过天晴,旋转双槽滑轮,防雨材料自行收拢。
the double groove steel is suspended under the two nodes of bottom chord of steel roof truss to prevent the bottom chord from stretch bending.
文章论述了在设计中采用钢屋架下弦两节点下悬吊双槽钢作为分布梁避免钢屋架下弦拉弯工作。
so this paper is related to the study of basic forming principles of cold rolling for double groove ball bearing outer rings from theory, numerical simulation and experiment.