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。
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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