【单选题】
A tackle by which the outer end of a boom is raised and lowered is the topping（）.
A、boom
B、lift
C、raise
D、tackle
查看正确答案A、Boom B、Lift C、Raise D、Tackle
搜题
更多“A tackle by which the outer end of a boom is raised and lowered is the topping（）.”相关的问题
第3题
A、can be overcome by using traditional techniques B、cannot be overcome by satellite system C、can be overcome by satellite and digital techniques D、cannot be tackled by any modern system
第7题
A、can be overcome by using traditional techniques B、can not be overcome by satellite system C、can be overcome by satellite and digital techniques D、can not be tackled by any modern system
