问题
选择题
将硝酸钾不饱和溶液转变为饱和溶液，最可靠的方法是（ ）
A．加入水
B．加入硝酸钾固体
C．加热该溶液
D．将该溶液放入冰箱
答案
A、加入水将硝酸钾不饱和溶液更加不饱和，故A错误；
B、加入硝酸钾固体可以将硝酸钾不饱和溶液转变为饱和溶液，故B正确；
C、硝酸钾的溶解度随温度的升高而增大，所以加热该溶液将硝酸钾不饱和溶液更加不饱和，故C错误；
D、硝酸钾的溶解度随温度的降低而减小，但是将该溶液放入冰箱不一定能将硝酸钾不饱和溶液转变为饱和溶液，故D错误．
故选B．
Because of his family’s Jewish background, they are sent to live in the concentration camps (集中营). Scared and alone, Joshua one day makes friends with a little mouse he calls Bethlehem who becomes his closest friend.
in faith and to be a cure for chromic depression(长期抑郁) … cure to strengthen identity and purpose.
presents the highlights of his 83 years of life, including his trips to India and the study of the writings of several great spiritual leaders.
How old is the Earth? The debate between science and religion continues to be heated. In Creation or Evolution, Michael Ebifegha examines these two opposed world views within the structure of empirical(实证的) science.
success whether in your current job, finding a new job, in education, family, or even hobbies.