患者,女,52岁,65|567缺失,可摘局部义齿修复,设计74|和|34做基牙,腭杆连接,卡环和腭杆采用金合金分别铸造,用焊料焊接法将卡环和腭杆焊接成整体,焊料焊接法对焊件接触面的要求中,下列哪一项是不正确的?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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