X线片示左下第一磨牙近中邻面阴影,探诊不敏感,冷测一过性敏感,叩诊(一),医生将该牙腐质去净,制备Ⅱ类洞型,单层垫底后银汞充填,医生所做的属于( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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