吊杆端箍 withe ; wythe ; derrick hoop ; boom iron

吊杆端滑车 head block

吊杆端下支索 boom sheet

吊杆端箍环 boom hoop

吊杆端舷侧支索 boom guy

桁端铁箍吊杆端箍 boom iron

吊杆端吊杆头 derrick head

吊货杆端部金属箍 derrick cap piece