问题 单项选择题

界面向速度一般()层速度。

A.大于

B.小于

C.等于

答案

参考答案:A

读下面材料,讨论回答下列问题:

(1)材料反映了当时什么政策?清朝为什么实行这样的政策?

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                              

                                                                                                                                                             

                                                                                                                                                             

(2)这种政策对社会发展有什么影响?应怎样认识它?

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                              

                                                                                                                                                             

                                                                                                                                                              

单项选择题