bolt with single borehole and multiple anchors

single borehole

single borehole multiple anchor cables

Double frequency pulsation double vertical ring high gradient magnetic separator

Double Vertical

double vertical line

vertical double riser pipe system

composite borehole vertical shaft

1# Generator Single Unit Initiating Single Pump

cable-stayed bridge with a single tower and single

cable-stayed bridge with single cable plane and single tower

single box single room

single column over single pile

Single hole with single initiation

single transmitter to single receiver

single warp and single weft weaving

sand shaped and mixed shaped alumna

double blind double dummy

Double blind double dummy randomized controlled clinical trial

Double Chambers and Double Layers