但是会容易滑牙特别是软材料如铝合金。这个设计的错误在于火花塞的seating 太深导致留下能攻丝的地方太薄。
但是会容易滑牙特别是软材料如铝合金。这个设计的错误在于火花塞的seating 太深导致留下能攻丝的地方太薄。
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