生活处处有化学,在实际生活中,下列物质的用途与其化学性质无关的是( )
A:用盐酸除去热水瓶中的水垢
B:用木炭烤羊肉串
C:用熟石灰改良酸性土壤
D:用干冰进行人工降雨
We need ________ kinds of things to make an ALL ABOUT ME box.
We don't have_______ salt at home. Could you go and get _______, please?
称取NaCl和BaCl2的固体混合物32.5g,加入100g蒸馏水,完全溶解后向该混合溶液中逐滴加入质量分数为10%的Na2SO4溶液,反应生成BaSO4沉淀的质量与所加入的Na2SO4溶液的质量关系如图所示.试回答下列问题:(提示:BaCl2+Na2SO4═BaSO4+↓+2NaCl)
“羌笛何须怨杨柳,春风不度玉门关”中的春风是指( )。
下句中,只有一处错误,请找出并改正。
Children should allowed to spend time playing with their friends.
____