[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fnC__uCNgvgifO6OOgb_GefCCSYprWxxBV9r0YWY-g1Q":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2026-03-03 16:59:52",320462517,[8,9,10,11],"6dB","12dB","3dB","9dB",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","在球面波声场中大平底距声源距离增大1倍,则回波减弱( )",[18,29,34,41,46,51,56,59,68,77],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],320462511,[22,23,24,25],"平面波","柱面波","球面波","以上都不对","远场范围的超声波可视为( )","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":33,"source":27,"type":28},[],320462512,[8,9,11,10],"在检测条件相同的情况下,面积比为2的两个平底孔,其反射波高相差( )",{"answer":35,"createTime":5,"id":36,"options":37,"question":40,"source":27,"type":28},[],320462513,[8,9,38,39],"24dB","18dB","在检测条件相同的情况下,孔径比为 4 的两个球形人工缺陷,其反射波高相差( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":45,"source":27,"type":28},[],320462514,[9,11,8,10],"在检测条件相同的情况下,直径比为 2 的两个实心圆柱体,其曲底面回波相差( )",{"answer":47,"createTime":5,"id":48,"options":49,"question":50,"source":27,"type":28},[],320462515,[8,9,10,11],"同直径的平底孔在球面波声场中距声源距离增大1倍,则回波减弱( )",{"answer":52,"createTime":5,"id":53,"options":54,"question":55,"source":27,"type":28},[],320462516,[8,9,10,11],"同直径的长横孔在球面波声场中距离声源距离增大1倍,则回波减弱( )",{"answer":57,"createTime":5,"id":6,"options":58,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":27,"type":28},[],320462518,[63,64,65,66],"增大6db","减小6db","增大3db","减小3db","对于柱面波,距声源距离增大1倍,声压变化是( )",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":27,"type":28},[],320462519,[72,73,74,75],"增大6dB","减小6dB","增大3dB","减小3dB","对于球面波,距声源距离增大1倍,声压变化是( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":27,"type":28},[],320462520,[81,82,83,84],"Φ1mm","Φ2mm","Φ4mm","Φ0.5mm","比φ3mm平底孔回波声压小7dB的同声程平底孔直径是( )"]