two digit是什么意思

用法例句

The performance,structure characteristic and operation principle of the 4-2-way solenoid directional valve were introduced.

介绍了二位四通电磁换向阀的性能、结构特点及工作原理,该阀有一个由脉冲电流控制或机(手)控制的电磁铁,具有两个稳定的工作状态,采用截止式密封。

This paper discusses the two-position detecting scheme for flexible gyro-based north seeker.

讨论了挠性陀螺寻北仪二位置寻北方案。