The tow processes of reducing 9-fluorenylformaldehyde to 9-fluorenyl-methanol are studied by using metal hydride and formaldehyde. The evaluation of the technics is given at last.

阐述了分别用金属氢化物、 甲醛作还原剂将9-芴甲醛还原为9-芴甲醇的工艺，并对工艺技术进行了评价。

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The theory and technics of recovering metal zinc from the hot galvanizing scrap by vacuum distillation are discussed. The calculation and industrial experiment show the feasibility of this method.

本文对热镀锌渣真空蒸馏回收金属锌的原理和工艺进行探讨，理论计算和工业试验均证实该法的可行性。

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But modern times, many technics have quit the mainstream stage of history for various reasons, and are replaced by metal surface technics that will adapt to contemporary society.

但到了现代，由于各种原因，许多工艺已经退出历史主流舞台，取而代之的是更适合现代社会的金属表面工艺。

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