复合性牙周炎指()
A.既有局部损害又有全身损害
B.既有骨上袋也有骨下袋
C.龈炎牙周炎同时存在
D.炎症损害与合创伤同时存在
E.以上均不对
参考答案:D
— Excuse me, sir,is the swimming pool open all day?
— Only from 6:OOpm to lO:OOpm. [ ]
A. That's right.
B. Yes,of course.
C. Sorry,I am not sure.
D. Sorry,I'm afraid not.
真空脱氧