Synthesis and Secondorder Nonlinear Optical Properties of Carbazoleazo Binary Compounds
咔唑偶氮二元化合物的合成及其二阶非线性光学研究

In this paper the primary relationship between the structure of thirdorder sequence and biotic macroevolution is discussed.
探讨了三级层序结构与生物宏演化阶段之间的可能关系。

Existence and Multiplicity of Positive Solutions for a Class of SecondOrder ThreePoint Nonlinear Boundary Value Problems
一类二阶三点非线性边值问题的正解存在性与多解性

It is possible to use a plutonium foil as a filter to remove the secondorder contamination.
可用钚箔作为过滤器消除二级干扰。

Pay attention to the wordorder of this sentences together. Can you correct the mistake
注意这句话的语气，你能纠正这个错误吗？

But the second and thirdorder intercept lines may be extended to intersect the extension of the.
但是二次和三次截止线可能延伸并和数出信号线相交。