患者,女,35岁,21|1缺失,设计43|23为基牙,烤瓷桥修复。金属基底冠和桥架分段铸造、研磨后,在未烧结瓷前焊接起来,是属于哪种焊接?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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