对于油类物质着火能用以下（）进行灭火。 ["水","干粉灭火器","沙子","二氧化碳灭火器"]
建立/修改/删除客户暂时地址交易授权级别为（）级 ["A.8","B.10","C.5","D.9"]
根据实名制登记工作内部责任考核要求被省公司通报考核区县公司总经理（）元。 ["200","300","500","1000"]
零余额时结清冲正交易授权级别为（）级 ["A.8","B.10","C.5","D.9"]
Fe主要有（）价态。 ["一价铁","二价铁","三价铁","四价铁"]
1829年，美国物理家亨利用什么代替裸铜线，进一步加强了电磁铁的磁场强度。
