对安全通道要求是什么?
参考答案:安全通道畅通、无障碍物,安全出口有明显标识,门向外常开,防火门应安装自动闭门器。
患者主诉全口义齿咀嚼时脱落,其最可能的原因是 ()
A.未制取功能性印模、肌功能修整不够
B.义齿边缘伸展过多
C.咬合无牙合平衡
D.义齿基托磨光面外形不正确
E.义齿基托与口腔黏膜不贴合
Bats are surprisingly long-lived creatures, some()a life span of around 20 years.
A. having
B. had
C. have
D. to have