问题 单项选择题

柴油机曲轴安装硅油减震器的目的是为了防止曲轴发生()共振。

A、往复

B、扭转

C、径向

D、轴向

答案

参考答案:B

问答题

结合所学知识回答下列中国古代经济的相关问题。

(1)我国古代小农经济的基本特点是?被我国古代政府视为立国之本的行业是什么?

                                                                                                                                                             

(2)东汉初年,南阳地方官杜诗有一项发明,比欧洲早了一千两三百年,请问这项发明的名称叫什么?

                                                                                                                                                             

(3)随着商品经济的发展,明朝中后期在江南的苏州、松江、杭州、嘉兴等地区,纺织业发展迅速,出

     现了一种怎样的新型雇佣关系?

                                                                                                                                                             

(4)明清时期,我国两大著名商人集团是什么?他们成功的秘诀是什么?

                                                                                                                                                             

                                                                                                                                                             

单项选择题 A1/A2型题