[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fKsFxuDVQe6WT8iPxDdpmAhrcs4D3G779oxNfJQJCYW4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":12,"related":13,"source":19,"type":29},[],"2026-05-26 16:03:42",388051594,[],{"courseId":9,"courseImg":10,"courseName":11},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","What alloying element and how much of it (weight percent) is necessary to make a stainless steel "stainless"? What types of surface film protects stainless steel? What are the four basic types of stainless steels",[14,21,26,30,35],{"answer":15,"createTime":5,"id":16,"options":17,"question":18,"source":19,"type":20},[],388051592,[],"The simplest stainless alloy contains ______and ______","v1",2,{"answer":22,"createTime":5,"id":23,"options":24,"question":25,"source":19,"type":20},[],388051593,[],"The types of stainless steels are , , duplex, martensitic and",{"answer":27,"createTime":5,"id":6,"options":28,"question":12,"source":19,"type":29},[],[],4,{"answer":31,"createTime":5,"id":32,"options":33,"question":34,"source":19,"type":29},[],388051595,[],"How to improve the corrosion-resistance of a steel by alloying?And what measures should we take to increase the strength of stainless steels",{"answer":36,"createTime":5,"id":37,"options":38,"question":39,"source":19,"type":29},[],388051596,[],"What is the basic composition of ferritic stainless steels? Why are ferritic stainless steels considered non-heat treatable? What are some applications for ferritic steels"]