. ---Can all the donation really reach those in earthquake-stricken area?

---Hard to say. Even if only 1% can reach them, I am still glad, as the saying goes, “____”.

A．The more, the better

B．Easier said than done

C．Better than never

D．Better than nothing

通过改变点火脉冲的振幅和频率，可控制液体发射药的燃烧，从而保持膛内压力峰值，是弹丸维持最大加速度的时间比普通火炮的长。