设置默认的打印机及打印纸，在打印机中设置纸张类型。这样就可以精确的设置打印纸的尺寸，这在针式打印机中连续走纸的情况下可以准确地设置打纸张的尺寸。 -Set the default printer and printing paper, paper type in the printer settings. This allows accurate printing paper size settings, which come and go in the dot matrix printer