In crane choosing , three parameters should be taken into consideration : payload capacity ( q ) , lifting height ( h ) and working radius ( r ) . and three parameters should meet design requirements at the same time 選擇起重機(jī)的型號原則是所選起重機(jī)的三個工作參數(shù),即起重量q ,起重高度h和工作幅度(回轉(zhuǎn)半徑) r均需要滿足班組結(jié)構(gòu)吊裝要求。