[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fcrNpHw_mHS9GPqcUxSd9mEozIa10kfUsrh6xfoO_jE8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":11,"question":18,"related":19,"source":30,"type":31},[],"2024-04-11 20:18:16",137889349,[8,9,10],"-0.7~-0.3MPa","-0.08~-0.3MPa","-0.08~-0.02MPa",{"count":12,"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},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","负压实型铸造真空度一般在()",[20,32,41,49,59,68,74,81,90,93],{"answer":21,"createTime":22,"id":23,"options":24,"question":29,"source":30,"type":31},[],"2024-04-07 12:19:58",137144376,[25,26,27,28],"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":33,"createTime":22,"id":34,"options":35,"question":40,"source":30,"type":31},[],137144377,[36,37,38,39],"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":42,"createTime":22,"id":43,"options":44,"question":48,"source":30,"type":31},[],137144378,[45,46,47],"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":50,"createTime":51,"id":52,"options":53,"question":58,"source":30,"type":31},[],"2024-04-07 12:53:07",137149471,[54,55,56,57],"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":60,"createTime":61,"id":62,"options":63,"question":67,"source":30,"type":31},[],"2024-04-17 22:05:41",137149474,[64,65,66],"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":69,"createTime":61,"id":70,"options":71,"question":73,"source":30,"type":31},[],137149477,[57,54,72],"粘砂","型砂的耐火性差,容易造成铸件()",{"answer":75,"createTime":76,"id":77,"options":78,"question":80,"source":30,"type":31},[],"2024-04-07 12:53:10",137149479,[47,79,46],"浇注速度太快","下列三种原因中,引起铸件缩孔的原因是()",{"answer":82,"createTime":76,"id":83,"options":84,"question":89,"source":30,"type":31},[],137149481,[85,86,87,88],"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":91,"createTime":5,"id":6,"options":92,"question":18,"source":30,"type":31},[],[8,9,10],{"answer":94,"createTime":5,"id":95,"options":96,"question":101,"source":30,"type":31},[],137889350,[97,98,99,100],"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","舂砂时,上下砂型的型砂紧实度应该()"]