利用四位双向移位寄存器等电子元件可制作能直观显示直流电流方向的模拟演示仪。
Four-bit bidirectional shift register was used to produce the device for demonstrating the direction of direct current.
一个气缸的双向运动代替两个执行元件的直线运动使其经济合理结构紧凑；
The straight line motion of two actuators was substituted by two directive motion of one pneumatic cylinder, which made the machine more economic and more compact.
板材夹具和加热炉采用自动和手动双向调节系统和埋入式陶瓷远红外辐射元件，提高热吸塑效果。
Both clamping devices and heating furnace has been adopted automatic and manual bi-directional regulating system and the embedded ceramic infrared parts to enhance the thermoforming effect.
板材夹具和加热炉采用自动和手动双向调节系统和埋入式陶瓷远红外辐射元件，提高热吸塑效果。
Both clamping devices and heating furnace adopt automatic and manual bi-directional regulating system and the inner pottery, far infrared parts to enhance the effect of plastic absorbing.
主电路采用反向串联的双向IGBT开关，用可编程逻辑元件实现四步切换，以保证安全换流。
To guarantee safe commutation, a four stepped switching strategy is realized by using programmable logic devices.
主电路采用反向串联的双向IGBT开关，用可编程逻辑元件实现四步切换，以保证安全换流。
To guarantee safe commutation, a four stepped switching strategy is realized by using programmable logic devices.
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