患者右下6龋洞深,探不敏感,热试验引起疼痛,刺激去除后,持续时间长,其原因可能是()。
A.急性牙髓炎
B.可复性牙髓炎
C.慢性牙髓炎
D.慢性增生性牙髓炎
E.牙髓坏死
参考答案:C
发生线路中断旅客要求退票时哪些部分不退?
My friend Bob just bought an apartment in a suburb of Beijing last week, which is much smaller than
ours but is three times________expensive.[ ]
A. very
B. so
C. too
D. as