下颌牙槽嵴低平的无牙颌患者全口义齿稳定主要依赖于()。
A.基托与黏膜的密合性
B.唇颊肌力的平衡
C.大气压力
D.义齿自身的压力
参考答案:B
-We'll go to visit Hawaii next week.
-Please __________ during the tour.[ ]
A. have a fun
B. have fun
C. have funs
D. have funny
采样区域面积越大,样品的代表性愈好。