患者,男,47岁,7621|156缺失,54|6作基牙,前牙区倒凹较大,行可摘局部义齿修复。为保证前牙美观效果义齿就位道的方向应为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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