BDI——虽然作为早期警报指数有用——总是具有不稳定性和夸大性，随交易其升降很大。
The BDI - though a useful early-warning index - is highly volatile and exaggerates apparent ups and downs in trade.
驱动器具有恒流斩波、指数升降频和正弦波等幅均匀细分的功能。
Meanwhile, the driver had the functions of constant current chopper, index movements frequency and sine wave equal-breadth even subdivision.
脉冲频率调节采用软件延时或硬件定时，升降频采用直线升降法、指数曲线升降法或抛物线升降法。
The frequency of feeding pulses is regulated by software's delaying or hardware's timing.
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