Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid. ["in series","in parallel","assembled","together"]
礼宾次序的排列有几种，分别是什么？
智能通知存款计息周期为每月月末最后一天至（）。 ["下月月末倒数第一天","下月月末倒数第二天","下月月初第一天","下月月初第二天"]
冲模加工制造的专用工具准备主要有哪些内容？
流通英镑中唯一未采用全息防伪措施的是多少面值的钞票（）。 ["10","20","50","100"]
什么是组合冲压加工工艺？
