问题
选择题
There is ___________ air-conditioner in ___________ room. [ ]
A. a; my
B. an; your
C. a; your
答案
答案：B
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There is ___________ air-conditioner in ___________ room. [ ]
A. a; my
B. an; your
C. a; your
答案：B
面深龋洞，探痛明显，冷热诊敏感。右下第二乳磨牙根尖区有一瘘管，挤压前庭沟，可见脓液流出，叩（++）。根尖周炎易出现瘘管的原因是（）