下列文件扩展名中请选择DCBA8y;_;d)^7\;G:k:r+e([-g/o/`3@2L是PowerPoint 演示文稿文件的扩展名。1e8r)j2o2l2B7h:k
A、bmp B、wav C、ppt D、doc1e8r)j2o2l2B7h:k