Finally the structures were released in a 49 % HF etch.最后在49%F中腐蝕形成這些結構.More often , all of the materials etchant have a finite etch rate.劑中的材料都具有一定的刻蝕速率.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, 所有暴露在刻蝕劑中的材料都具有一定的刻蝕速率.Hydrofluoric acid of Porcelain Etchant and phosphoric acid of UNI - ETCH are severe eye and tissue irritants.瓷酸蝕劑...
我還有兩把槳和那個舵把和那根短棍. ”I have the two oars and the tiller and the short club. "他將一根根短棍木柴扔進巨大的石壁爐里。He dumped the logs on the big stone hearth.短棍落下去的當地,他覺得好象碰到了一塊堅韌的橡皮.He felt the tubbery solidity as the club came down....
He's got a bee in his bonnet about factory farming.他滿腦子都是工廠化養殖的事兒。He left a job in the City to take up farming.他辭去倫敦商業區的工作，開始務農。Traditional slash and burn farming methods have exhausted the soil.傳統的刀耕火種農業方式耗盡了土地的肥力。...