Acid number of upgrading heavy oil had little change.
改质稠油酸值几乎没有变化。
With the function of regeneration, and can bring down the acid number of FRF efficiently.
具有再生功能，有效降低抗燃油酸度。
Results show that three materials have little effect of inhibiting the raise of acid number.
结果表明，三种包装袋对抑制酸价升高的作用不大。
A number of cities in the south had an acid rain frequency exceeding 80%.
许多南方城市的酸雨频率已经超过了80%。
A number of cities in the south had an acid rain frequency exceeding 80%.
许多南方城市的酸雨频率已经超过了80%。
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