谢谢cdxwg.最好有这种装置的图纸或者照片。还有,如果能够说服业主,这个是不需要的? & @4 v ]/ |! w7 G& t以下是他们给的技术指导书中关于这个装置的描述: " \% X9 _8 J& E3.3.8 Hooks and hook blocks% p0 X! `* _" `
The hooks shall be made of forged steel and shall swivel on antifrication bearings arranged to exclude dirt and equipped for lubrication. Hook shall have a locking device which, when engaged,will lock the hook in the desired orientation. 8 H) S: m( {% o$ \3 n' T3 F Hook blocks shall be constructed from rolled steel and have close fitting guards.8 M! _" \. k; [2 y
谢谢大家积极讨论了。