Ad Hoc网络拓扑结构：
参考答案：
对等式平面结构；分级结构。
一患者因右颌下区反复肿痛10年，进食后疼痛加重，颌下区可触及硬块，检查可及颌下腺导管沙砾样结石，其治疗宜采用（）。
A.进食酸性食物
B.全身应用抗生素
C.理疗
D.导管结石摘除
E.下颌下腺摘除
Aunt Li often asks her son ______ too much meat. It's bad for his health. [ ]
A. don't eat
B. not to eat
C. not eat
D. to not eat
