Abstract In this paper,the hardening and tempering treatment as well as the mechanical properties has been studied after the superstrength steel D6AC welded with another steel.
研究了D6AC超高强度钢与异种钢
焊后调质处

学性能。
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阅读真题精听
7月合集 Buildings can become greener. They can use more recycled steel and can be prefabricated in off-site factories, greatly reducing lorry journeys. But no other building material has environmental credentials as exciting and overlooked as wood.
建筑可以变得更绿色。它们可以增加再生钢
的使用,还可以在工地外的工厂中 预制组件,大大减少对货运的需求。但各种建筑
料中,具有最让人兴奋的环保特性却也最受忽视的还是木
。
5/6月合集
9月合集
4月合集
2月合集
5月合集 

听力真题精听
4月合集
7月合集 Ehsan Khoman and Soojin Kim of MUFG, a bank, estimate that a 25% tariff will push up the cost of a tonne of steel imported into America from $755 to over $900, negating a cost advantage that America currently enjoys over Europe.
三菱日联银行的厄桑·科曼和金素珍估计,25%的关税将使进口到美
的每吨钢
价格从755美元推高至900美元以上,这将抵消美
目前相对于欧洲的价格优势。