导水裂缝带是指开采煤层上方一定范围内的岩层发生垮落和断裂，产生裂缝，且具有导水性。
参考答案：对
Windows操作：
(2)查找Word.exe文件。
He__________ the envelope and recognized his father's handwriting. [ ]
A. stared at
B．glared at
C. looked at
D.glanced at
