不完全的燃烧和不适当的通风条件能导致乙炔的产生.Incomplete combustion and improper draft conditions can cause ethylene formation.已多次证实火焰中存在聚乙炔.That polyacetylenes are present in flames has been demonstrated many times.这种反应构成了制备芳基环丙基乙炔的有效方法.This...
refractory metals难熔金属For processing the high tensile metals: carbon stell common alloy stell, hard bronze forgeable castiron. etc.加工高抗张强度的金属: 碳素钢 、 硬青铜和可锻铸铁等.Gold retains its lustre for far longer than other metals...黄金保...
He put a pudgy arm around Harry's shoulder.他用粗胖的胳膊搂住哈丽的肩膀。Each time he straightened his pudgy knees it was apparent that they were trembling.每次他伸直胖乎乎的膝盖时可以看出膝盖在哆嗦.The wizard clapped a pudgy hand to his vast forehead...
A method for the determination of micro amounts of vanadium in ferrochromium was presented.用催化动力学示波极谱法测定铬铁中微量钒.Objective To explore the determination method of Vanadium content in cassia seed.目的探讨富钒决明子芽中钒含量的测定方法.Vanadium...