— Oh, his father was angry with him and slapped him ____face.
A:on the
B:in the
C:in
D:on
We ____(see) you in two weeks.
鸭梨味甜、香脆,野生梨味酸,但适应性强.将鸭梨的枝条嫁接到野生梨的砧木上,成活后所结果实的果味是( )
①向滤渣中加入稀盐酸,可能有气泡产生 ②向滤液中加入稀盐酸,一定有沉淀产生
③滤渣中一定含有Ag,可能含有Fe和Al
④滤液中一定含有Fe(NO3)2,一定不含有AgNO3和Al(NO3)3.