搜题请搜索小程序“爱下问搜题”
问题 选择题
将电阻R1=3Ω的导体与电阻为R2的导体串联后总电阻为9Ω，则R1与R2并联后总电阻是（　　）

A．6Ω

B．4Ω

C．2Ω

D．1Ω

答案

答案：C

材料分析题

每年的清明节，我们要在陕西省的黄帝陵，湖南省的炎帝陵举行公祭仪式。

据此回答：我们为什么要举行这样的仪式？举行这样的仪式有什么重要意义？

                                                                                                                                                              

                                                                                                                                                               

                                                                                                                                                               

                                                                                                                                                              

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问答题 简答题

计算题：某锅炉炉膛出口过剩空气系数是1.2，求该处的氧量？
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