Because the gradient vectors here are f sub x, z If you have a third variable z gz then you have also an equation f sub z equals lambda g sub z.
因为这里，梯度向量就是，如果还有一个变量,那就还有一个等式fz等于λ乘以。
In particular, some upper bounds of the vertex arboricity of the integer distance graph G(Z, D) are obtained when D is a set of positive integers and Z the set of all integers.
特别地，当D是某正整数集合，Z是整数集时，得出了整数距离图G（Z ，D）的点荫度的几个上界。
Wu J. g, C. H. Shi, H. Z. Zhang and L. J. Fan, Study on analysis of oil content in intact rapeseed with few sample size by near infrared reflectance spectroscopy.
吴建国、石春海、张海珍和樊龙江，应用近红外反射光谱法整粒测定小样品油菜籽含油量的研究。
Shi C. H. , R. W. Du, D. W. Lin, W. G. Zhang and Z. T. Shen, A new indica rice variety Zhe-Nong 8010 with disease resistance, high quality and yield.
石春海、杜如伟、林大为、章旺根和申宗坦，优质高产抗病早籼品种浙农8010的选育及利用。
Ni G Z, Qian X Y. Numerical Simulation of Electromagnetic Field. Beijing: Advanced Education press, 1996.139~170
倪光正，钱秀英．电磁场数值计算．北京：高等教育出版社，1996．139～170。
Wu J. g, C. H. Shi, H. Z. Zhang and W. X. Fei, The Determination of Three Types of Essential Amino Acids Content in Milled Rice by Near Infrared Reflectance Spectroscopy.
吴建国、石春海、张小明和费万辛，用近红外反射光谱法分析稻米三种必需氨基酸含量的研究。
Wu J. G, Shi C. H and Zhang H. Z, Study on Developing Calibration Model of Fat Acid Composition in Intact Rapeseed by Near Infrared Reflectance Spectroscopy.
吴建国、石春海和张海珍，构建整粒油菜籽脂肪酸成分近红外反射光谱分析模型的研究。
JI Z J, HAN B, HOU G Y, et al. Electromagnetic wave absorbing properties of cement-based expanded perlite mortar with graphite[J]. Materials Science and Technology, 2011,19(2):15-18.
[17] 冀志江，韩斌，侯国艳，等。石墨为吸波剂水泥基膨胀珍珠岩砂浆吸波性能研究[J]。材料科学与工艺，2011，19（2）：15-18。
JI Z J, HAN B, HOU G Y, et al. Electromagnetic wave absorbing properties of cement-based expanded perlite mortar with graphite[J]. Materials Science and Technology, 2011,19(2):15-18.
[17] 冀志江，韩斌，侯国艳，等。石墨为吸波剂水泥基膨胀珍珠岩砂浆吸波性能研究[J]。材料科学与工艺，2011，19（2）：15-18。
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