（） are more suitable for large quantities at low pressure. ["Reciprocating pumps","Rotary pumps","Centrifugal pumps","Gear pum"]
简述假全刺棘环虫的主要特征。
冷冲压生产的质量内容应有哪些？
（）are included in the Queen’s enemies． ["Public enemies","Pirates","Robbers","The enemies of the state to which the merchants belong"]
简述上级听取下级汇报时应注意的礼仪。
保证冷冲生产质量的措施有哪些？
