derrick leg height [油气] 井架腿高
stiff leg derrick 定脚起重杆 ; 刚性柱架
beam-leg dynamic derrick 桁架结构井架
timber stiff leg derrick 木肢起重杆
sheer leg derrick 两脚临时吊杆
stiff-leg derrick crane 定腿式人字起重机
shear-leg derrick crane 合撑式起重机
Derrick stiff leg 定肢起重杆
Derrick shear leg 双肢起重杆
应用推荐