[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$foUeGIAz0hD9EMzGdO-YCkbPF_4XN3YF-RKV-yGRVcQo":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-04-11 20:18:16",137889350,[8,9,10,11],"上型比下型紧实度要大","下型比上型紧实度要大","由操作者自定","均匀一致",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},18,"6ff62bf2880a7c52e0e324d092cc1088","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5aa1e010016a00d72d96151e16aafd59.png","工程训练C","work_33405944","5 铸造章节作业","舂砂时,上下砂型的型砂紧实度应该()",[21,33,42,50,60,69,75,82,91,99],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-04-07 12:19:58",137144376,[26,27,28,29],"便于起模","提高浇注时间","防止冲坏砂型","增加铸件强度","铸造圆角的主要作用是()","v1",0,{"answer":34,"createTime":23,"id":35,"options":36,"question":41,"source":31,"type":32},[],137144377,[37,38,39,40],"高的熔点","好的流动性","小的偏析性","小的收缩性","为了获得外形完整、轮廓清晰的铸件,要求铸造合金具有( )",{"answer":43,"createTime":23,"id":44,"options":45,"question":49,"source":31,"type":32},[],137144378,[46,47,48],"砂型退让性不足","浇注温度太高","浇注温度太低","铸件产生缩孔,原因之一是()",{"answer":51,"createTime":52,"id":53,"options":54,"question":59,"source":31,"type":32},[],"2024-04-07 12:53:07",137149471,[55,56,57,58],"气孔","夹渣","缩孔","裂纹","型砂中加入水分过多,型砂湿度太大,铸件可能产生()",{"answer":61,"createTime":62,"id":63,"options":64,"question":68,"source":31,"type":32},[],"2024-04-17 22:05:41",137149474,[65,66,67],"增加强度","增加耐火性","增加透气性","大型型芯中放焦炭的目的之一是()",{"answer":70,"createTime":62,"id":71,"options":72,"question":74,"source":31,"type":32},[],137149477,[58,55,73],"粘砂","型砂的耐火性差,容易造成铸件()",{"answer":76,"createTime":77,"id":78,"options":79,"question":81,"source":31,"type":32},[],"2024-04-07 12:53:10",137149479,[48,80,47],"浇注速度太快","下列三种原因中,引起铸件缩孔的原因是()",{"answer":83,"createTime":77,"id":84,"options":85,"question":90,"source":31,"type":32},[],137149481,[86,87,88,89],"自行车中轴","车床上进刀手轮","螺栓","机床丝杠","下列工件中适宜用铸造方法生产的是()",{"answer":92,"createTime":5,"id":93,"options":94,"question":98,"source":31,"type":32},[],137889349,[95,96,97],"-0.7~-0.3MPa","-0.08~-0.3MPa","-0.08~-0.02MPa","负压实型铸造真空度一般在()",{"answer":100,"createTime":5,"id":6,"options":101,"question":19,"source":31,"type":32},[],[8,9,10,11]]