Let's call it q. P is the point that coordinates x, y, h.
就叫它q,p的坐标是。
We want to know whether a given vector field with components P, Q and R can be written as f sub x, f sub y and f sub z for a same function f.
要看向量场,能否写成，其中f是同一个函数。
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侯喜君，张连清，王春华，李玉强双极股骨头置换治疗高龄股骨颈骨折108例随访☆。
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Li Q C, Jiang Y J. The Principle of Spectral Instrument. Beijing: Beijing Institute of Technology Press, 1999.33~37
李全臣，蒋月娟．光谱仪器原理．北京：北京理工大学出版社，1999．33～37。
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