实验题(5分)
修正液是同学们常用的一种文具,打开后,有刺激性的气味。我们不禁要问:修正液对人体有害吗?请你设计一个实验,对这个问题进行探讨。
【实验材料】修正液、小白鼠6只、米饭、水、关小白鼠的笼子。
【提出问题】                                                                      
【作出假设】                                                                      
【设计方案】                                                                                                                                       
                                                                                                                                   
                                                                                                                                 
【现象】                                                                            
【结论】                                                                         
 0  68599  68607  68613  68617  68623  68625  68629  68635  68637  68643  68649  68653  68655  68659  68665  68667  68673  68677  68679  68683  68685  68689  68691  68693  68694  68695  68697  68698  68699  68701  68703  68707  68709  68713  68715  68719  68725  68727  68733  68737  68739  68743  68749  68755  68757  68763  68767  68769  68775  68779  68785  68793  150026 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网