【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?
【单选题】某人为正视眼,如近点为20C、m,那么他的调节范围为()。
【单选题】______,this or that?
【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?