固定义齿悬空式桥体的龈面与牙槽嵴黏膜之间至少应留出的间隙为 ()
A.1.5mm
B.2mm
C.3mm以上
D.1.5mm以下
E.8mm以上
参考答案:C
I'd rather have a room of my own, however small it is, than _____ a room with others. [ ]
A. to share
B. to have shared
C. share
D. sharing
TIFF图像文件格式的开发者是()。
A.microsoft
B.aldus
C.adobe
D.apple