问题 单项选择题

在照明不足或阅读物对比度不足的情况下,因(),视网膜上的弥散圆变大,目标更加模糊。

A、入射光线弥散

B、瞳孔散大

C、瞳孔缩小

D、集合不足

答案

参考答案:B

问答题

       邓 * * 说:“马克思说过,科学技术就是生产力,事实证明这话讲的很对。依我看科学技术是第一生产力”。 从你所知道的中外科技发明中,各举两例,并分别说明这些发明对促进社会进步的作用。

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

单项选择题