问题 单项选择题

属于缓冲区

A.上颌牙槽嵴
B.磨牙后垫
C.切牙乳突
D.颊侧前庭
E.粘液腺导管开口

答案

参考答案:C

问答题

       在天下的千万条道路中,“丝绸之路”以影响深远广泛、名字优美动听而闻名于世。作为重要的商业通道,“丝绸之路”是联系中外的纽带,沟通东方和西方的桥梁。你知道汉代“丝绸之路”的路线吗?请写出来。

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

问答题