单项选择题 Which logic dose the following reasoning belong to ?Fact 1: The victims of cyber bullying are emotionally upset. Fact 2: The victims of cyber bullying are likely to withdraw from family members and friends. Fact 3: The victims of cyber bullying may avoid school or group gathering. Conclusion: Cyber bullying is harmful.

判断题 在节点电压法中，等号右边的电流为流入节点为负，流入节点为正。

单项选择题 关联方交易的形式众多，隐蔽性较差。（）