The urea-formaldehyde resin is formed by the reaction of urea, formaldehyde, aldehyde, one or more stabilizers and modifier according to the route of weak base-weak acid-weak base.
脲醛树脂由尿素、甲醛、二醛和一种或多种稳定剂、改性剂，按照弱碱-弱酸-弱碱 的路线反应而得。
At last, compared with anti-S transform control, the inverse control has a better effect on the process changing from strong acid to weak acid or from strong base to weak base.
最后比较了逆模型控制和反s变换控制，逆模型控制有更好的效果，可以很好控制酸性到弱酸和碱性到弱碱的情况。
Applicable to weak base, weak acid, oli, especially resistant to abrasive medium.
适用于弱碱，弱酸，油类，尤其能耐研磨性介质。
Buffer Solution usually containing a weak acid and its conjugate weak base, or a salt, of such a composition that the pH is held constant within a certain range.
通常指含有一种微酸和与之结合的一种微碱或盐，并能维持酸碱值基本恒定的溶液。
Has the characteristics of vacuum suction, strong self-priming capacity, can automatically power ruled out air in pipe, voice low, weak acid weak base corrosion resistance.
具有真空吸水的特性，自吸能力超强，能自动强力排除水管中空气，嗓音低、耐弱酸弱碱腐蚀。
Especially prevent the corrosion effectively from moist, water vapor, dust, various sorts of chemical corrosive gas, chemical corrosive substances such as weak acid weak base;
特别能有效防护潮湿、水汽、灰尘、各种化学腐蚀性气体、弱酸弱碱等化学腐蚀物质的侵蚀；
This study provides further basis for the use of natural bones as bone implants. It showed that in weak acid and weak base the pig bone hydroxyapatite was stable, …
实验表明猪骨在弱酸弱碱溶液中羟基磷灰石相是稳定的，但晶粒尺寸、结晶度和非晶含量有所变化。
This study provides further basis for the use of natural bones as bone implants. It showed that in weak acid and weak base the pig bone hydroxyapatite was stable, …
实验表明猪骨在弱酸弱碱溶液中羟基磷灰石相是稳定的，但晶粒尺寸、结晶度和非晶含量有所变化。
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