问题 单项选择题

关于管电压、管电流的叙述,正确的是

A.管电压是峰值、管电流是平均值

B.管电压是峰值、管电流是有效值

C.管电压是有效值、管电流是平均值

D.管电压是峰值、管电流是峰值

E.管电压是平均值、管电流是有效值

答案

参考答案:A

问答题

       “五年计划”是中国国民经济计划的一部分,主要是对全国重大建设项目、生产力分布和国民经济重要比例关系等作出规划,为国民经济发展远景规定目标和方向。你知道我国第一五年计划的任务有哪些吗?

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                           

单项选择题