静电的特点是（）。 ["容量小","电压高","电流大","易发生放电产生火"]
什么叫胆心反射？如何预防和处理？
学前儿童社会教育研究的核心任务是：研究学前儿童社会教育的基本问题，揭示学前儿童社会教育的（）。
Which two can directly cause a thread to stop executing？（） [" Exiting from a synchronized block."," Calling the wait method on an object."," Calling the notify method on an object."," Calling the notifyAll method on an object."," Calling the setPriority method on a thread object."]
横波
水土流失
