【单选题】称取钢样2.000 g,充分燃烧后产生的SO2通入50.00 mL 0.01000 mol/L NaOH溶液中吸收,过量的NaOH用0.01000 mol/L HCl溶液返滴定至酚酞终点,消耗30.00 mL,则钢样中硫的质量分数为[Ar(S)=32.06, H2SO3的pKa1=1.89,pKa2=7.20]
【判断题】避雷器一般接于各段母线与架空线的进出口处,装在被保护设备的电源侧,与被保护设备串联
【单选题】在Excel97中当操作数发生变化时,公式的运算结果()。
【简答题】艰苦补贴(hardship allowances)
【简答题】液化石油气汽车的简称是?液化天然气汽车的简称是?
【判断题】避雷器一般接于各段母线与架空线的进出口处,装在被保护设备的电源侧,与被保护设备串联。
【简答题】A.By developing a proper character. B.By experiencing hardship. C.By getting inspired by great people. D.By doing writing to criticize oneself.