When the plating exist defect, the gold - plating nickel - plating both promote the stress - corrosion fracture of Kovar alloy.在镀层存在缺陷时, 镀金、镀镍层均促进柯伐合金的应力腐蚀开裂....
Dena bought rolls of silk that seemed ridiculously cheap.德娜买了几卷看起来非常次的丝绸。Rolls Royce produces around 1,000 extremely desirable cars a year.劳斯莱斯公司每年生产约1,000辆非常吸引人的汽车。The rolls of distant thunder were growing more ominous....