Others have articulated joints attaching them to the logging tool, with a backup arm to press the pad against the borehole wall.
另有一些极板需要使用连接装置才能和下井仪器相连，测井时需要使用推靠臂才能紧贴井壁。
2
IDAHO FALLS - Doug Hansen wrapped his arm around a rolled up fire hose and - as if it were a bowling ball - tossed the firefighter's tool out onto the field where it unfurled for several yards.