热噪声一般不属于（） A.起伏噪声 B.脉冲噪声 C.高斯噪声 D.白噪声

Frame Relay is simplified form of (51) , similar in principle to (52) , in which synchronous, frames of data are routed to different destinations depending on header information.
Packets are routed throught one or more Virtual Circuits known as (53) . Most Virtual Circuits are (54) , which means that the network provider sets up all DLCI connections at subscription time. (55) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

A．Permanent Circuits

B．Permanent Virtual Circuits

C．Switched Virtual Circuits

D．Switching Circuits

依评价主体的不同。医德评价可分为两种，它们是（）

A.病人评价和家属评价

B.院长评价和同事评价

C.社会评价和自我评价

D.外在评价和自我评价

E.社会评价和内在评价

按过程调查：优点是目标集中易体现安全管理的符合性，缺点是（）。

用凸轮推动柱塞往复运动，将低压燃油压缩成高压燃油，再通过柱塞分别将高压燃油送入各气缸的喷油嘴，采用这种高压燃油供给方式的有（）发动机。

A.直列喷油泵式

B.分配泵式

C.电控单体泵式

D.高压共轨

既能平肝潜阳、镇惊安神，又能聪耳明目、纳气定喘的药物是（）

A.龙骨

B.牡蛎

C.朱砂

D.磁石

E.石菖蒲