问题 问答题 简答题

能见度在30米以内的有雾天气行车时,最高车速为多少?

答案

参考答案:能见度在30米以内的有雾天气行车时,最高车速为20km/h以下。

探究题

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】                                                                         

问答题