论述裸地上群落形成的过程。
什么是概率的统计定义，其适用条件是什么？
物体内在的感觉叫质感。
影响独立性的主要因素不包括（）。 ["利害关系","委托代理关系","信息不对称","利益关系"]
You add a particular e-mail address to the Blocked Senders list in the Microsoft Windows Mail application. You still receive messages from this e-mail address. You need to prevent the receipt of all e-mail messages from this e-mail address. What should you do?（） ["A","B","C","D"]
为什么自耦变压器不能作为安全电压电源？
