Finally the structures were released in a 49 % HF etch.最后在49%F中腐蚀形成这些结构.More often , all of the materials etchant have a finite etch rate.剂中的材料都具有一定的刻蚀速率.Can some one suggest a suitable etch or sequence of etches to achi...
More often, all of the materials exposed to the etchant have a finite etch rate.通常, 所有暴露在刻蚀剂中的材料都具有一定的刻蚀速率.Hydrofluoric acid of Porcelain Etchant and phosphoric acid of UNI - ETCH are severe eye and tissue irritants.瓷酸蚀剂...
He's got a bee in his bonnet about factory farming.他满脑子都是工厂化养殖的事儿。He left a job in the City to take up farming.他辞去伦敦商业区的工作，开始务农。Traditional slash and burn farming methods have exhausted the soil.传统的刀耕火种农业方式耗尽了土地的肥力。...
我还有两把桨和那个舵把和那根短棍. ”I have the two oars and the tiller and the short club. "他将一根根短棍木柴扔进巨大的石壁炉里。He dumped the logs on the big stone hearth.短棍落下去的当地,他觉得好象碰到了一块坚韧的橡皮.He felt the tubbery solidity as the club came down....