短語詞組短語bar iron crane [機(jī)]鉄條起重機(jī)bar r crane 桿式起重機(jī)bar steel suspension crane 型懸掛行車Four -bar linkage of portal crane 門座起重機(jī)四連桿結(jié)搆four -bar linkage structure of crane 門機(jī)四連桿結(jié)搆 返回 bar crane