题目

人站在绝缘板上，手扶着起电机，头发竖起来，则头发带电的方式属于（           ）                                                                                                   　   A． 摩擦起电                                  B． 接触起电 　   C． 感应起电                                  D．  以上方式都不属于                                                                                                                            答案：B

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