问题
选择题
It's impolite to point anyone your chopsticks. [ ]
A. to; at
B. at; with
C. out; in
D. on; by
答案
答案：B
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It's impolite to point anyone your chopsticks. [ ]
A. to; at
B. at; with
C. out; in
D. on; by
答案：B
缺失，故
固定义齿，
全冠，
冠已松动，继发龋。其松动的原因是（）