1. If the pulse counter has no latch function and occurs carrying or borrowing when it is read by MCU, the data read from the pulse counter maybe wrong, and then the performa… 针对没有锁存功能的脉冲计数器，提出了一种改进的读取方法，有效地避免了在读取过程中由于计数器进位或借位造成的读数偏差。
2. A special reverse control system on the double-cylinder single-acting hydraulic drilling pump is introduced, and the structure and working principle of this system are expounded. The revere performa… 介绍了双缸单作用液压钻井泵所采用的一种特殊的换向控制系统，阐述了该系统的结构和工作原理，并对其技向性能进行了分析，指出它具有结构简单、排量均匀、换向准确、平稳和可靠等特点。
