[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fmnxM5fPZgp_A6HX6LN03MUi6yMST4NDOHhbr7JIZfPE":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",320462520,[8,9,10,11],"Φ1mm","Φ2mm","Φ4mm","Φ0.5mm",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","比φ3mm平底孔回波声压小7dB的同声程平底孔直径是( )",[18,29,38,45,50,55,60,65,74,83],{"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":37,"source":27,"type":28},[],320462512,[33,34,35,36],"6dB","12dB","9dB","3dB","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":39,"createTime":5,"id":40,"options":41,"question":44,"source":27,"type":28},[],320462513,[33,34,42,43],"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":46,"createTime":5,"id":47,"options":48,"question":49,"source":27,"type":28},[],320462514,[34,35,33,36],"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":51,"createTime":5,"id":52,"options":53,"question":54,"source":27,"type":28},[],320462515,[33,34,36,35],"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":56,"createTime":5,"id":57,"options":58,"question":59,"source":27,"type":28},[],320462516,[33,34,36,35],"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":61,"createTime":5,"id":62,"options":63,"question":64,"source":27,"type":28},[],320462517,[33,34,36,35],"在球面波声场中大平底距声源距离增大1倍,则回波减弱( )",{"answer":66,"createTime":5,"id":67,"options":68,"question":73,"source":27,"type":28},[],320462518,[69,70,71,72],"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":75,"createTime":5,"id":76,"options":77,"question":82,"source":27,"type":28},[],320462519,[78,79,80,81],"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":84,"createTime":5,"id":6,"options":85,"question":16,"source":27,"type":28},[],[8,9,10,11]]