Based on PWM technique, the energy from battery discharges return to the master tape of DC, which has the advantage transmitting energy through two directions and realizes energy callback.
采用PWM调节方式，实现了能量的双向传递，将电池放电能量回馈到直流母带，解决了电池放电能量利用这一技术难题。
The control card may indicate that the program is on the master system tape or on CARDS.
控制卡可以指出程序是在主系统带上还是其他卡片上。
Master: (1) A plate for a duplicating machine or small offset machine. (2) Original tape, disc, film, etc from which copies will be made.
纸版，（2）原版样：（1）复印机或小型柯式机用的印版。（2）作复制用的原版磁带，磁带，菲林等。
A master copy of something such as a film or a tape recording is an original copy that can be used to produce other copies.
柯林斯字典里查来的英语解释，电影或磁带就是指母带。可以用来做其他拷贝。在专业词汇里面的意思应该跟上面一样的。
A master copy of something such as a film or a tape recording is an original copy that can be used to produce other copies.
柯林斯字典里查来的英语解释，电影或磁带就是指母带。可以用来做其他拷贝。在专业词汇里面的意思应该跟上面一样的。
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