一种定义
四种语言
State-of-the-art fastening technology withstands many thousand load changes without screws having to be retightened.
What's more the creep behaviour associated with plastic-coated steel tubes meant that screws had to be retightened on a very frequent basis.
Racks and trolleys do not require continuous maintenance work such as retightening loose connections and adjusting struts that have moved out of place.