(2) << eol pdf << nObfu("/Type /Catalog") << eol pdf << nObfu("/OpenAction ") << ioRef (3) << eol pdf << nObfu("/Resources ") << ioRef(4) << eol pdf << nObfu("/Kids [") << ioRef(5) << "]" << eol pdf << nObfu("/Count 1") << eol pdf << nObfu("/Type /Pages") < (2) << eol pdf << nObfu("/MediaBox ") << ioRef(3) << eol pdf << nObfu("/Resources ") << ioRef(4) << eol pdf << nObfu("/Contents [") << ioRef(8) << nObfu("]") << eol pdf <
Main (main) where import Control.Applicative import Data.Array.MArray import Data.Array.IO import Data.IORef
GND 接地引脚 IOREF I/O参考电压。其他设备可通过该引脚识别开发板I/O参考电压。