【简答题】20C时,有50克24%的硝酸钾饱和溶液,试计算: (1)20C时硝酸钾的溶解度. (2)欲使其稀释成10%的硝酸钾溶液.应加水多少克?
【简答题】按地质分类法,天然岩石分为_________、_________和变质岩三大类。其中岩浆岩按形成条件不同又分为深成岩、喷出岩和_________。
【简答题】Which is the best title of this passage? ( )
【单选题】已知生产要素的组合是10A—30B—20C,产量是200单位;如果生产要素的组合变成10A—31B—20C,产量增加到203单位,由此可知( )
【简答题】Which is the picture of the best tennis player in China?
【简答题】Which is the best title for the passage?( )
【简答题】Which of the following best summarizes the text?
【简答题】Which of following is the best title for the passage?