例文
- Fasteners take various forms, for example with threaded ends to use as an embedded bolt, with washers at the tips that grip softer material etc . For photos and descriptions of various fasteners see the PATMI Basic Training Manual . http : / / www . patmi . org / wp-content / uploads / 2015 / 10 / PATMI-Manual-2014 . pdf Common nails should never be used for powder-actuated fastenings.