内有192个原理图和192个pcb图 液体点滴速度监控装置；液体点滴速度监控装置；自制PIC单片机编程器电路.......等等(There are 192 schematics and 192 pcb diagrams Liquid drip speed monitoring device; liquid drip speed monitoring device; self-made PIC Microcontroller Programmer circuit; etc.)