1. This paper gives the conversion formula from the first type surface integral to the first type curvilineal, and sets a example of using the method to solve exercises.
2. Set up a curvilineal equation of acid-base titration, and every pHysics meanings in the equation and factors of the effect its titrate suddenly jump range were discussed.
建立了酸碱滴定的滴定曲线方程，并讨论了方程中各项的物理意义及影响滴定突跃范围的因素。
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3. Set up a curvilineal equation of acid-base titration, and every pHysics meanings in the equation and factors of the effect its titrate suddenly jump range were discussed.
