对全口义齿固位和支持有利的黏膜是()
A.厚、松软
B.厚、韧
C.薄
D.薄、干燥
E.B或D
参考答案:B
This _____ is small. Do you have a big one? [ ]
A. shirts
B. short
C. pant
D. shirt
先天性心脏病出现下半身青紫,应考虑为
A.房间隔缺损B.室内隔缺损C.动脉导管未闭D.法洛四联征E.二尖瓣狭窄