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frame crane
chem. 龙门吊
construct. 龙门〔门式,塔架,高架〕起重机
hydroel.st. 龙门吊; 门架式起重机
met. 龙门起重机
tech. 龙门起重机; 固定式门式起重机
frame crane: 4 phrases in 2 subjects
Hydroelectric power stations2
Technology2