结合钢箱筒结构取代抛石基床作为码头和防波堤基础首次在工程中成功应用的实践，论述了钢箱筒结构特点和作用机理。
Character and action principle of steel cylindrical structure is presented in this paper, which is first applied successfully in wharf and breakwater foundation taking place of rubble bed.
在此基础上讨论了溶液中样品的结构、取代基对其结构、构象的影响和取代基的化学位移规律。
The structure of samples in solution, the influence of R-substitution on conformation, and the rule of R-substituted chemical shifts were discussed.
研究表明配位键的强度不仅受取代基R的影响，而且还与环结构的变化有关。
The strength of the dative bond deponds not only on the substituents R, but also on the skeletal structure of the parent ring.
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