Lana may go with us. Please . [ ]
A. call up her
B. call her up
C. call she up
答案:B
基底面只与唇颊黏膜的一小部分轻轻接触,舌侧呈三角形开放
A.鞍基式桥体B.单侧接触式桥体C.盖嵴式桥体D.船底式桥体E.悬空式桥体