固定桥选择基牙时,临床冠根比例若能以 1:2 或 ___ 较为理想,但若达不到,则冠根比为 ___ 时是选择基牙的最低限度,否则需要增加基牙。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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