PD9waHAKJG15c3FsX2hvc3QgPSAnbG9jYWxob3N0JzsKJG15c3FsX3VzZXIgPSAnY3RvdXInOwokbXlzcWxfcGFzc3dvcmQgPSAnMTIzcXdlcnQnOwokbXlzcWxfZGIgPSAnY3RvdXInOwo/

2단 시린더

2단 시린더