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That stems from the predominance of unit banking in the States or the lack of nationwide branch chains .

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The central 5, 5'-disubstituted bipyridine units of each ligand coordinate theNi or Fe ion, while all the terminal 6-monosubstituted bipyridine units of the ligands keep free of coordination, as the result trinuclear triple-stranded helicate 〓 can not form. This is considered to be caused by the steric hindrance of the methylene substituents α to the chelating nitrogens of the terminal bipyridine units and the strain caused by linkage mode.

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In this paper,the problems of the large traveling grate stocker hot water boilers applied at the present time are investigated and analyzed,and the main designing principles for the large traveling grate stocker hot water boilers are proposed,according to the characteristics of the central heating system operation.

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