题干

下列反应属于氧化还原反应的是(  )

A:Al(OH)3+NaOH═NaAlO2+2H2O

B:2Na+2H2O═2NaOH+H2

C:Na2O+CO2═Na2CO3

D:2NaHCO3═Na2CO3+CO2↑+H2O

上一题 下一题 0.0难度 选择题 更新时间:2017-12-18 05:38:38

答案(点此获取答案解析)

B

同类题2

阅读下面的诗文,回答相关问题。

                                                                                                          《饮酒》
                                                                                                            陶渊明

                                                                                             结庐在人境,而无车马喧。
                                                                                             问君何能尔,心远地自偏。
                                                                                             采菊东篱下,悠然见南山。
                                                                                             山气日夕佳,飞鸟相与还。
                                                                                              此中有真意,欲辩已忘言。

同类题5

阅读下面的文言文,完成下面的问题。

      【甲】王子曰:仲永之通悟,受之天也。其受之天也,贤于材人远矣之为众人,则其受于人者不也。彼其受之天也,如此其贤也,不受之人,且为众人;今夫不受之天,固众人,又不受之人,得为众人而已耶?

                                                                                                                                                                                      (节选自《伤仲永》)

      【乙】人之为学,不日进则日退。独学无友,则孤陋而难成。久处一方,则习染而不自觉。不幸而在穷僻之,无车马之资,犹当博学审问,古人与稽,以求其是非之所在,庶几⑥⑤可得十之五六。若既不出户,又不读书,则是面墙之士,虽有子羔、原宪之贤,终无于天下。子曰:“十室之邑,必有忠信如丘者焉,不如丘之好学也。”夫以孔子之圣,犹须好学,今人可不勉乎?

                                                                                                                                                                              (节选自顾炎武《与友人书》)

      【注解】①孤陋片面、浅陋。②资盘缠。③审详细。④稽探究、考察。⑤庶几差不多。⑥子羔、原宪孔子的弟子。⑦邑地方,⑧丘孔子。⑨勉勤勉,努力。