【判断题】
实验证明，通电导体的周围与磁体的周围一样，存在着磁场，这种现象称为电流的磁效应
A. 对
B. 错
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答案
A
解析
暂无解析
相关试题
【判断题】
跨步电压触电，当带电体有电流流入地下时（如电网的一根导线因绝缘损坏或断裂而碰地），在接地点周围的土壤中产生电压降。人靠近接地点时，两脚之间就承受电压，称为跨步电压
A. 对
B. 错
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Present-day society is much freer and easier because it emphasizes _________. ___
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【单选题】
Which is the main idea of the last paragraph? ______________ ___
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【单选题】
Permissive parents would ________. ___
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【单选题】
The fact that parents check the contents of the book or the film for their children to read or see shows __________. ___
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【单选题】
Which of the following statements is NOT true?____________ ___
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【单选题】
What does the word “corrupt” in Para.4 mean?__________ ___
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【单选题】
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