组件所有外露接口均设有防护堵、盖，且封闭良好，接口螺纹和法兰密封面无损伤；
All accessory interfaces should have protection covers with good sealing, there is no damage on the connecting screws and flange sealing surface.
铝基复合材料内螺纹攻丝属封闭切削，加工难度大，丝锥极易折断。
It is very difficult to tap inside Aluminum matrix composites. The process is difficult to operate due to its close condition, and the tap is subject to breaking.
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