crutch boom [= boom rest
boom socket [= boom step]
cargo boom {single travelling boom}
BEDO RAM Burst EDO RAM
突发式扩展数据输出内存
突发式扩充数据输出随机存取存储器
FPM RAM Fast Page Mode RAM
3-boom hydraulic rock drilling jumbo
a baby boom in the last Year of the Dragon
additional bending moment on derrick boom
articulated boom platform
backhoe boom control valve