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It is infrequence in China that the weld high - temperature high - pressure hydrogenation pipe is cracked short time.高溫高壓 臨氫管道焊縫迅速發(fā)生裂紋,國內(nèi)罕見....

infrequence的音標(biāo)：infrequence的英式發(fā)音音標(biāo)為：[?n'fri:kw?ns]infrequence的美式發(fā)音音標(biāo)為：[?n'frikw?ns]...

n.很少發(fā)生，罕見...