焊缝区在经过长时运行后板条状组织减少, 等轴状组织增多.In welding zone the lath shape microstructure reduces, and equiaxed microstructure increases.我们的电话号码 、 传真号码和地址全部丝印在产品的后板上.Our phone number, fax number and address are listed on the rear cover....

“后板”的英语可以翻译为：ackboard ...