-         the science lab?

-It's behind the library.[ ]

A.How's

B.Why's

C.Where's

D.What

卡体进入基牙倒凹区，可造成

A．义齿弹跳
B．义齿摘戴困难
C．恶心、唾液增多
D．粘膜广泛压痛
E．咬合时基牙酸痛、敏感