【One question per day] [Static Equipment Exchange Edition...Question 47] March 18, 2020..True or False Question

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0240550093.jpg 【One question per day] [Static Equipment Exchange Edition...Question 47] March 18, 2020...True or False Question......................................................................Reward Rules: Correct answer 5 wealth ； Participate in explaining 10 Fortunes. ....................................................................1. GB9948 10 and 20 steel pipes with an outer diameter less than 70mm and a wall thickness less than 6.5mm should be subjected to impact tests at 20°C and 0°C respectively. The average impact energy of the three longitudinal standard specimens should not be less than 31J. The lower service temperature limits of 10 and 20 steel pipes are -20°C and 0°C respectively. A. Correct B. Wrong................................................................................B. (not less than 70mm, not less than 6.5mm)