单项选择题
A.types B.kind C.series D.type
When the derrick changes its （）(角度), its lifting capaci...
单项选择题When the derrick changes its （）(角度), its lifting capacity changes correspondingly.
A.angel B.length C.height D.angle
The derrick can’t be （）(超载).A.exceededB.overloadedC.ove...
单项选择题The derrick can’t be （）(超载).
A.exceeded B.overloaded C.overtaken D.loaded
（）(摆动)the derrick to shore side.A.TopB.LowerC.SwingD.Ad...
单项选择题（）(摆动)the derrick to shore side.
A.Top B.Lower C.Swing D.Adjust
