有可能，如果是解压缩正常得到了一个pdf文件，那么就是acrobat reader版本不够高，要6.0以上，或者用我上载的foxit软件试试。

how are you going for SEM machine operating?
i have leart SEM machine operating for one month,but I still often can not make image clear.

Thanks for your question. so i find the great form.