补充下列SN74HC04芯片测试程序：……Mprintf(".............Function test............\n");Mprintf(".............A=L B=H? test............\n");_reset(); /*复位*/_wait(10);___________________/*设置电源通道1，选择4档电流，电压为5V*/_set_logic_level(5,0,4.5,1);……