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標準下載>NB/T 20005.12-2017 壓水堆核電廠(chǎng)用碳鋼和低合金鋼第12部分:主蒸汽系統、主給水流量控制系統、輔助給水系統和汽輪機旁路系統用無(wú)縫鋼管 Carbon steel and low alloy steel for pressurized water reactor nuclear power plants—Part 12: Seamless steel pipes for use in main steam systems, feedwater flow control system免費下載