根据要求写成语。   

1．来源于神话故事的：                                                                                                     

2．来源于历史故事的：                                                                                                   

3．来源于寓言故事的：                                                                                                

4．表现人物美好品质的：                                                                                            

5．描写人物神态的：                                                                                               

影响混悬剂沉降速度的主要因素是微粒的半径、两相的密度差和（）。