[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fPQ2O8qnpc08ixOk6tpQfaRP8sDlrUpE_CDXGUnSp1Xc":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":10,"question":13,"related":14,"source":24,"type":31},[],"2026-04-20 10:38:44",1089305661,[8,9],"对","错",{"courseImg":11,"courseName":12},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F16b08883a10975cc926c879c81d4307b.jpg","材料科学基础","过冷是结晶的必要条件,无论过冷度大小,均能保证结晶过程得以进行.( )",[15,26,32,41,46,55,64,67,72,82],{"answer":16,"createTime":5,"id":17,"options":18,"question":23,"source":24,"type":25},[],1089305562,[19,20,21,22],"边形核边长大","先形核后长大","自发形核和非自发形核","枝晶生长","液态金属结晶的基本过程是( )","v2",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":30,"source":24,"type":31},[],1089305592,[8,9],"金属化合物的特点是硬而脆,莱氏体性能也是硬而脆,故莱氏体属于金属化合物.( )",3,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":24,"type":25},[],1089305597,[36,37,38,39],"加入形核剂","减小液相过冷度","对液相实施搅拌","增加液相过冷度","凝固时不能有效降低晶粒尺寸的是以下哪种方法.( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":45,"source":24,"type":31},[],1089305640,[8,9],"置换固溶体不可能是无限固溶体.( )",{"answer":47,"createTime":5,"id":48,"options":49,"question":54,"source":24,"type":25},[],1089305653,[50,51,52,53],"2%","2. 06%","2. 11%","2. 2%","在Fe-Fe3C相图中,钢与铁的分界点的含碳量为( )",{"answer":56,"createTime":5,"id":57,"options":58,"question":63,"source":24,"type":25},[],1089305655,[59,60,61,62],"切应力","最大压应力","最大拉应力","不能确定","零件中的流线应与其工作时所受到的( )方向一致",{"answer":65,"createTime":5,"id":6,"options":66,"question":13,"source":24,"type":31},[],[8,9],{"answer":68,"createTime":5,"id":69,"options":70,"question":71,"source":24,"type":31},[],1089305689,[8,9],"在实际生产条件下,金属凝固时的过冷度都很小(<20℃),其主要原因是由于非均匀形核的结果.( )",{"answer":73,"createTime":5,"id":74,"options":75,"question":80,"source":24,"type":81},[],1089305691,[76,77,78,79],"温度高,晶粒长大速度快","杂质和合金元素阻碍晶界运动","第二相质点阻碍晶界运动","小角度晶界的移动速度小于大角度晶界的移动速度","再结晶晶粒长大的影响因素包括( )",1,{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":24,"type":81},[],1089305695,[86,87,88,89],"γ-Fe的溶碳能力比较大,可获得较大的渗层深度","温度高,扩散系数增加","γ-Fe的扩散系数比较大","γ-Fe的致密度比较大","工业生产中,渗碳一般选择在γ-Fe中进行,原因在于( )"]