非全日制用工劳动报酬结算支付周期最长不得超过（）天。 ["10","30","15","60"]
什么叫评估渠道成员的总销售成本比较法？
劳动合同期限一年以上三年以下，试用期不得超过（）个月 ["2","3","6","1"]
动物集群生活的好处有（） ["防御捕食者","提高觅食成功性","提高种群遗传多样性","更容易找到配偶"]
A screw pump belongs to （） according to its working principle. ["reciprocating pumps","positive displacement pumps","centrifugal pumps","centripetal pum"]
简述电解液循环的操作步骤。
