儿童CPAP治疗的常用压力范围是:()
A.0~1cmH2O
B.2~3cmH2O
C.4~6cmH2O
D.7~10cmH2O
E.10~15cmH2O
参考答案:C
全口义齿稳定与哪些因素有关()
A.平衡
B.磨光面形态
C.人工牙排列位置
D.基托材质
E.牙槽嵴状况
28. It is only when agriculture is fully developed___________industry can have abundant materials and markets.
A.that
B.when
C.before
D.Until