7 Permanent weld backing bars, consumable inserts and nonconsumable insert rings are not permitted without prior written approval from SECCO.
事先没有赛科公司的书面批准,
允许有永久焊接的支撑杆、熔化性嵌条和
熔嵌环。

耗的7 Permanent weld backing bars, consumable inserts and nonconsumable insert rings are not permitted without prior written approval from SECCO.
事先没有赛科公司的书面批准,
允许有永久焊接的支撑杆、熔化性嵌条和
熔嵌环。
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