He was involved in oil, zinc and lead prospecting.他参与了石油、锌和铅的勘探。Brass is an alloy of copper and zinc.黄铜是铜锌合金。the fusion of copper and zinc to produce brass铜与锌熔合成黄铜...
Zinc dialkyl dithiophosphate ( ZDDP ) is disintegrated with wet method. S, P, Zn is determinated.用湿法分解二烷基二硫代磷酸锌盐 ( ZDDP ) 样品,同时测定硫 、 磷 、 锌的含量.Recovery of cobalt from Co - Ni residue in zinc hydrometallurgy has been studi...
Parents often feel helpless, knowing that all the cuddles in the world won't stop the tears.父母经常感到无能为力，因为他们知道无论多少次拥抱也无法止住眼泪。Oh, to think of his poor wife, standing there helpless…噢！想想他可怜的妻子，无助地站在那里。They felt helples...
To investigate the exocrine compounds of coptotermes formosanus dinergate exocrine concentrate was obtained by different extraction.本文主要讨论采用不同提取方法所得家白蚁兵蚁的外分泌化合物的组成及相对含量的变化.Exocrine Glands may consist of only single cells...