This paper first review maintain theoretical model of the existing safety culture, as the theoretical basis of the study.
在此基础上提出了企业安全文化演进的理论模型，试图向人们描述企业安全文化演进的一般规律；
The first major evolution to the True Union Ball Valve, Model-B, introduced the Tru-Bloc concept, a functional safety feature.
TrueUnion球阀的第一次重大改进是型号B，引进了Tru - Bloc的设计理念，一种更加安全的性能。
The first major evolution to the True Union Ball Valve, Model-B, introduced the Tru-Bloc concept, a functional safety feature.
TrueUnion球阀的第一次重大改进是型号B，引进了Tru - Bloc的设计理念，一种更加安全的性能。
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