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。
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。
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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