新斯的明的主要作用是

A.影响递质的生物合成

B.影响递质的代谢

C.影响递质的储存

D.直接作用于受体

E.影响递质的释放

哪种情况下不能设计单端固定桥()

A.尖牙缺失

B.第二、三磨牙缺失

C.修复前牙小间隙

D.上颌侧切牙缺失

E.第一、二磨牙缺失

Some of her suggestions have been adopted, but others have been turned ______ as they are not practical enough.

A．down

B．away

C．out

D．back

骨髓增生明显活跃时，成熟红细胞与有核细胞的比值是()

A.1：1

B.10：1

C.20：1

D.50：1

E.200：1

The terrorists had ______ their prisoner in a small room. However, they had not chained him to the wall.

A．restrained

B．refined

C．confined

D．restricted

确定全口义齿中线标志，哪项是错误的？()

A.眉间点

B.鼻尖点

C.人中沟

D.唇系带

E.舌系带