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Question 1: How long will the true-PDF of GB/T 223.39-1994_English be delivered?
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Question 5: Should I purchase the latest version GB/T 223.39-1994?
Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 223.39-1994 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.