伸缩套杆式天线杆
collapsible(sable) radio mast
三天线式天线极化量测法
three-antenna (polarization) method antenna measurement
双天线式天线增益量测法
two-antenna (gain) method antenna measurement
伸缩杆管体
telescopic rod-tube
telescopic rod-tube penetrators
伸缩式管子井架
duplex design tubular derrick
伸缩式线盘卸料器
collapsible stripping spider