manganese peroxide二氧化锰The sample was molten and decomposed with sodium peroxide , leached and acidified hot water and - volumed.试样以过氧化钠熔融分解,热水浸取、酸化,定容.Explain why barium forms peroxide but beryllium does not.解释为什么钡能形成过氧化...
既定的惯例是很难更改的.Established practices are difficult to modify.对任何既定的分配来说, 平均收入水平越低, 贫困的范围就越大.For any given distribution, the lower the average income level, the greater the incidence of poverty.主持人: 现在这个事情已经尘埃落定了, 这已经是既定的事实....