常见的石器类型有砍砸器类、刮削器类、尖状器类、雕刻器类、球形器类和()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
向文本文件中写入字符数据,在任何时候都只需要用到文件写入器类(FileWriter),不需要用到缓冲写入器类(BufferedWriter)。
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