稳压管是工作在反向击穿区的。
Which statements are true， given the code new FileOutputStream（"data"， true） for creating an object of class FileOutputStream？（） FileOutputStream has no constructors matching the given arguments.。 An IOExeception will be thrown if a file named "data" already exists.。 An IOExeception will be thrown if a file named "data" does not already exist.。 If a file named "data" exists， its contents will be reset and overwritten.。 If a file named "data" exists， output will be appended to its current contents.。
简述证据制度与诉讼制度的关系。
简述我国证据制度的基本原则及其要求。
论述学前儿童手工教学需注意的问题。
影响需求价格弹性的因素有（）
