瓶阀出厂时应（）出具合格证。 ["逐批；","逐只；","按比例；","随机"]
Which statement creates a new user?（） [" CREATIVE USER susan;"," CREATIVE OR REPLACE USER susan;"," CREATE NEW USER susan DEFAULT"," CREATE USER susan IDENTIFIED BY blue;"," CREATE NEW USER susan IDENTIFIED BY blue;"," CREATE OR REPLACE USER susan IDENTIFIED BY blue"]
应纳增值税的企业，下列销售额中含增值税的有（）。 ["销售给使用单位","销售给消费者","小规模的纳税人销售给小规模纳税人（未代开票）","零售商店销售化妆品"]
混合并购
进入有毒有害部位作业，必须使用适当的防毒面具，在空气中氧含量低于18%，有毒气体高于20%的场所，应该使用（），严禁使用（）。
防腐
