全口义齿排牙要求牙弓与颌弓相一致,即牙列可按颌弓基本形态排成方圆、尖圆、卵圆形。下列与上述要求的目的无关的是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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