问题
选择题
Do you have any idea ______ on earth has happened to our friend?[ ]
A. that
B. what
C. as
D. which
答案
答案：B
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Do you have any idea ______ on earth has happened to our friend?[ ]
A. that
B. what
C. as
D. which
答案：B
缺失，唇侧牙槽骨丰满，余无异常，在设计可摘局部义齿时，模型应作的倾斜方向是（）