The workers then add a glass cover, bolt on an aluminum frame, attach a junction box and package it for shipping.
工人们接下来用螺栓给一个铝框装上一个玻璃盖板，附上一个接线盒，然后包装发运。
2
Brittle fracture accident and countermeasure of the high-strength bolt of post junction of roof beam of.
钢结构梁柱连接处高强螺栓的脆性断裂事故及对策。
3
The junction of bonding jumper should be clean and covered with conductive paste. And the tightening moment for bolt must fit with equipment wiring requirements.