基于双向变流器技术的蓄电池充放电装置具有充电和放电功能，同时实现了网侧电流正弦化及单位功率因数，因而减少了对电网的谐波和无功污染。

The device for battery charge or discharge based on the technology of bidirectional converter can be used in charging or discharging battery, and realize sine wave of ac and unity power factor.

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介绍了双向双螺杆挤出机用传动箱，新型止推装置可替代传统的止推包。

Introduced the driving gear box for bi-directional twin screw extruder, the new thrust device can instead of the traditional thrust fit.

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转膛体作间歇的转停运动，在其停留位置上，为了实现准确可靠的定位，设置有双向卡锁装置。

In its pausing position, a locker device is set symmetrically to precisely and credibly locate the proper position of the revolver.

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