正确答案: C
            生产、生活使用的天然水必须经软化 
            题目:下列有关硬水及其软化的说法中错误的是:
             解析:C
 
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            学习资料的答案和解析:
                                                    
                                 
                
                 [单选题]The discussion should reach beyond scientific societies because __________.
                                                
                  
                                                                                                                                                                                                             people need to work together to prevent the bad use of science 
                                            
                
                
                            
                
                 [单选题]The Somali robbed frequent attacks on the sea urged the United Nations to all nations to take immediate action.
                                                
                  
                                                                                                                                                                 call on  
                                                                                        
                
                
                            
                
                 [单选题]细胞色素C是一种由104个氨基酸构成的蛋白质。分别测定兔、蛇、龟、鲸和马五种动物细胞色素C的氨基酸序列,发现了马与其他动物的氨基酸差异个数(见下表)。据此推测,四种动物中与马亲缘关系最近和最远的分别是 ( )
                                                
                  
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         鲸和蛇 
                                                                                        
                
                
                            
                
                 [单选题]26_______
                                                
                  
                                                                                                                     pale