A:不锈钢做硬币
B:用亚硝酸钠腌渍鱼
C:用硫酸填充蓄电池
D:纯碱制洗涤剂
Is it __________ boring job? No, it is __________ interesting work.
把0.00259四舍五入保留两个有效数字,用科学记数法表示为( )