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"mechanism": { "type": "sequence", "steps": [ { "targetId": "bridge-inlet", "kind": "identify", "directionHint": "拆开进油管", "effects": [ { "targetId": "bridge-inlet", "offset": [ -0.6, 0, 0 ] } ] }, { "targetId": "bridge-inlet-bag", "kind": "identify", "directionHint": "包扎进油管口", "effects": [ { "targetId": "bridge-inlet-bag", "offset": [ 0, 0, -0.65 ] } ] }, { "targetId": "bridge-outlet", "kind": "identify", "directionHint": "拆开出油管", "effects": [ { "targetId": "bridge-outlet", "offset": [ 0.6, 0, 0 ] } ] }, { "targetId": "bridge-outlet-bag", "kind": "identify", "directionHint": "包扎出油管口", "effects": [ { "targetId": "bridge-outlet-bag", "offset": [ 0, 0, -0.65 ] } ] } ] } }, "toolId": "", "measurement": "", "assessment": { "weight": 9.090909090909092, "requiredDimensions": [ "action", "sequence" ], "passPolicy": "all-required" }, "audio": { "narrationSource": "offline", "narrationText": "第3步，拆开并包扎进出油管。用大活动扳手拆开液压泵进、出油管接头，用塑料袋包扎管口。", "successCue": "ui", "errorCue": "collision-error", 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"toleranceDegrees": 8, "directionHint": "拆下第 4 个安装螺栓", "effects": [ { "targetId": "bridge-pump-bolt-4", "offset": [ 0, 0, 0.65 ] } ] } ] } }, "toolId": "", "measurement": "", "assessment": { "weight": 9.090909090909092, "requiredDimensions": [ "action", "sequence" ], "passPolicy": "all-required" }, "audio": { "narrationSource": "offline", "narrationText": "第4步，拆下四个安装螺栓。用开口扳手拆下液压泵与取力器之间的四个安装螺栓。", "successCue": "ui", "errorCue": "collision-error", "narrationUrl": "/legacy/virtual-training/narration-revisions/junhao-v2-20260921/TASK-VIRTUAL-007-step-04.mp4", "narrationAssetCode": "", "narrationVideoAssetCode": "DH_787B4C212CF644AE9A3D8D49DEDCB65E", "digitalHuman": { "enabled": true, "mode": "video", "videoSource": "library", "videoId": "68", "videoName": "重型支援桥前泵换件修复 · 4 拆下四个安装螺栓", "appId": "AP_238179E0A10F97927EA49FA3", "videoUrl": "", "generatedVideoUrl": "", "generationStatus": "generated" }, "narrationFallbackUrl": 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"mechanism-operation", "instruction": "进一步裁剪牛皮纸，使其与液压泵安装面及取力器结合面吻合。", "guidance": "进一步裁剪牛皮纸，使其与液压泵安装面及取力器结合面吻合。", "warning": "", "success": "修裁牛皮纸：三维操作已保存", "cameraPolicy": "focus", "action": { "kind": "mechanism-operation", "targetId": "bridge-paper", "requiresPlacement": false, "durationMs": 700, "mechanism": { "type": "identify", "steps": [ { "targetId": "bridge-paper", "kind": "identify", "directionHint": "按安装面修裁纸垫", "effects": [ { "targetId": "bridge-gasket", "visible": true }, { "targetId": "bridge-paper", "visible": false } ] } ] } }, "toolId": "", "measurement": "", "assessment": { "weight": 9.090909090909092, "requiredDimensions": [ "action", "sequence" ], "passPolicy": "all-required" }, "audio": { "narrationSource": "offline", "narrationText": "第6步，修裁牛皮纸。进一步裁剪牛皮纸，使其与液压泵安装面及取力器结合面吻合。", "successCue": "ui", "errorCue": "collision-error", "narrationUrl": "/legacy/virtual-training/narration-revisions/junhao-v2-20260921/TASK-VIRTUAL-007-step-06.mp4", "narrationAssetCode": "", 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