如图所示，理想变压器原线圈接在交流电源上，副线圈向电阻R1、R2和R3供电， A为理想交流电流表，V为理想交流电压表，开关S闭合后与闭合前相比

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如图所示，理想变压器原线圈接在交流电源上，副线圈向电阻R₁、R₂和R₃供电， A为理想交流电流表，V为理想交流电压表，开关S闭合后与闭合前相比（）

A：V示数变大，A示数变小，R₁消耗的电功率变大

B：V示数变大，A示数变大，R₁消耗的电功率大

C：V示数变小，A示数变小，R₁消耗的电功率变小

D：V示数变小，A示数变大，R₁消耗的电功率变小

上一题下一题 0.0难度选择题更新时间:2019-04-18 10:55:17

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D

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阅读短文从方框中选择适当的单词填空（每词限用一次）

by mountains if finally long

     Long long ago, there was a very old man called Yu Gong. There were two ____ Near his house. They were so high and big that it took a____ time to walk to the other side.The old man told his family that they should help him to move the mountains.
    Yu Gong and his family kept on digging day after day and year after year. ____ a god was so moved ____ Yu Gong that he sent two gods to take the mountains away.
    This story reminds us that you can never know what will happen ____ you don't try to do it．

6－4=____	6－5=____	6－3=____
6－1=____	6－2=____	6－0=____

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