[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fcSkwboSTl-7eoZ09KR2RdzGss9xEkRcqdtbaZjxx4GU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2026-01-13 20:38:58",311611710,[8,9,10,11],"去除 PCB 表面污染物","使焊膏重新熔化实现元器件与 PCB 可靠连接","精准放置元器件","切割多余引脚",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","回流焊的核心功能是( )",[18,29,38,47,56,65,74,77,86,95],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],311611704,[22,23,24,25],"仅表面贴装元件 PCB","通孔插装与混装电路板","高密度微型 PCB","柔性电路板","波峰焊主要适用于以下哪种电路板的批量焊接( )","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],311611705,[33,34,35,36],"冷却系统","氮气系统","助焊剂回收系统","抽风系统","回流焊中,能有效避免无铅焊膏氧化的系统是( )",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":27,"type":28},[],311611706,[42,43,44,45],"降低焊料熔点","去除氧化层防止虚焊","增加焊料流动性","清洁 PCB 表面油污","波峰焊工艺中,喷涂助焊剂的核心作用是( )",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":27,"type":28},[],311611707,[51,52,53,54],"从 230℃降至 75℃以下","自然冷却","从 230℃降至 100℃以下","缓慢降温避免应力","回流焊冷却区的合理降温要求是( )",{"answer":57,"createTime":5,"id":58,"options":59,"question":64,"source":27,"type":28},[],311611708,[60,61,62,63],"80-120℃","90-130℃","120-150℃","183-230℃","波峰焊中,预热温度一般控制在哪个范围( )",{"answer":66,"createTime":5,"id":67,"options":68,"question":73,"source":27,"type":28},[],311611709,[69,70,71,72],"170℃","183℃","200℃","230℃","波峰焊常用的共晶焊料 Sn63\u002FPb37 的熔点是( )",{"answer":75,"createTime":5,"id":6,"options":76,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":27,"type":28},[],311611711,[81,82,83,84],"恒温区","预热区","回流区","冷却区","回流焊温度曲线中,用于去除焊膏中溶剂和水分的温区是( )",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":27,"type":28},[],311611712,[90,91,92,93],"速度越快,焊接质量越好","速度越慢,焊接质量越好","速度与焊接质量无关","速度需要根据焊膏类型和峰值温度调整","回流焊炉的传送带速度通常如何影响焊接质量( )",{"answer":96,"createTime":5,"id":97,"options":98,"question":103,"source":27,"type":28},[],311611713,[99,100,101,102],"焊炉开始升温时的温度","焊膏熔化时的最高温度","焊炉冷却结束时的温度","焊炉预热阶段的温度","在 SMT 回流焊工艺中,&quot;峰值温度&quot;指的是什么( )"]