Welding process certification test is an important test complied with EN standard to validate the welding process, ensure the welding quality and meet the requirements of manufacture in large scale.
焊接工艺认证试验是在焊接生产中根据欧洲标准，验证焊接工艺、保证焊接质量，从而满足大规模生产需要的重要试验。
High-level ARCH effect is certification in the BDI logarithm process by ARCH LM test, GARCH(1,1)model is used to eliminate the conditional heteroscedasticity.
通过ARCHLM检验认为BD I对数序列存在高阶ARCH效应，并用GARCH（1，1）模型消除残差序列的条件异方差性。
The test number can be used to trace the particular certification process which was carried out.
测试编号可用来追踪该证书的认证过程。
The test number can be used to trace the particular certification process which was carried out.
测试编号可用来追踪该证书的认证过程。
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