玻璃离子水门汀的性能如下，除外
A．生物相容性好
B．黏结性能较强
C．韧性强且耐磨
D．色泽与牙近似
E．含氟可以防龋
参考答案：C
---- Is there a vaccine _____ pig influenza?, I’m anxious to know.
----- Don’t worry, there is a vaccine _____ for pigs against pig influenza
A．for; available
B．against ; use
C．to; access
D．against; available
我国高等院校98%以上集中在城市。
