[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fphOTBawDVhqPyBFl6L9tgneZpoYfi-Gaa1lL0GhpSnM":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2026-01-11 21:22:09",309670619,[8,9,10,11],"若\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb2d77f48a9d5e199b6736ca12b49a056.webp\">全大于零,则方程表示的曲面是椭球面","若\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb2d77f48a9d5e199b6736ca12b49a056.webp\">两正一负,则方程表示的曲面是单叶双曲面","若\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb2d77f48a9d5e199b6736ca12b49a056.webp\">两负一正,则方程表示的曲面是双叶双曲面","若\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb2d77f48a9d5e199b6736ca12b49a056.webp\">有一个为零,则方程表示的曲面是抛物柱面",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","已知方程\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4b915468eb58a7042538ae9de79a358a.webp\">,则下列说法错误的是",[18,29,38,47,56,65,68,76,81,86],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],309670614,[22,23,24,25],"单叶双曲面","椭球面","双叶双曲面","双曲抛物面","方程\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2185552f2e150c36d1d78d16d1c089ba.gif\">表示的曲面是","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],309670615,[33,34,35,36],"椭圆","抛物线","双曲线","直线","以下哪项不可能是单叶双曲面的平截线",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":27,"type":28},[],309670616,[42,43,44,45],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F05ef65eb154d7def95971365d8c72740.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fba0fc019b7dcd8964d9aaeae3b43dd5d.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3ca7f2d257a534858bd231ab769ebfdc.webp\">","平面不存在","曲面\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4e0590db813ca8a2618ac309a8aeced6.webp\">与平面相截成两条相交直线的平面是",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":27,"type":28},[],309670617,[51,52,53,54],"1","2","3","4","双叶双曲面\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F653eb38d7a033c1332c503687f61cd5d.webp\">的对称轴个数",{"answer":57,"createTime":5,"id":58,"options":59,"question":64,"source":27,"type":28},[],309670618,[60,61,62,63],"单叶双曲面,有心","双叶双曲面,有心","单叶双曲面,无心","双叶双曲面,无心","方程\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb34e3d7cf776d4646f5fd43b5ba30bf6.webp\">表示( )曲面,它是( )曲面",{"answer":66,"createTime":5,"id":6,"options":67,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":69,"createTime":5,"id":70,"options":71,"question":74,"source":27,"type":75},[],309670620,[72,73],"正确","错误","单叶双曲面的平截线都是双曲线",3,{"answer":77,"createTime":5,"id":78,"options":79,"question":80,"source":27,"type":75},[],309670621,[72,73],"双曲面可以由直线运动生成",{"answer":82,"createTime":5,"id":83,"options":84,"question":85,"source":27,"type":75},[],309670622,[72,73],"建筑中采用单叶双曲面的主要原因之一是因为外形漂亮",{"answer":87,"createTime":5,"id":88,"options":89,"question":90,"source":27,"type":75},[],309670623,[72,73],"有心曲面是有界曲面"]