问题
选择题
If you ______ help others, you won't have any friends.[ ]
A. won't
B. don't
C. aren't
答案
答案：B
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If you ______ help others, you won't have any friends.[ ]
A. won't
B. don't
C. aren't
答案：B
缺失，口腔检查可见：缺牙区牙槽嵴丰满，余牙正常，口底与舌侧龈缘距离约为10mm，舌侧牙槽嵴形态为斜坡型，拟铸造支架义齿修复。
为基牙，通常在其上设计的卡环是（）