aeons of geological history数以亿万年计的地质史The workers skirted the edge of the cliff on a geological survey.工人们沿着崖壁作了一次地质勘察.The mines had been closed down following a geological survey.继一次地质调查之后,这些矿井已被关闭了....
Stainless steel bolts and nuts shall be tightened on manhole covers.人孔盖使用不锈钢螺栓和螺母拧紧.We also supply pickling line, Degreasing line, Annealing furnace for stainless steel.我公司还承揽各种不锈钢酸洗生产线 、 不锈钢脱脂生产线 、 光亮退火生产线等.This paper i...