头颅摄影的常规体位是（） A.头颅后前位和侧位 B.头颅前后位和侧位 C.头颅前后位

深层搅拌法大型工程设计前应先进行室内配合比试验，并应选在正式工程附近，地质条件相近的地点进行现场试验工程，检验（），以及搅拌设备系统工作的稳定性。

A.搅拌土体的均匀性

B.搅拌土体的强度

C.搅拌土体着底标准

D.搅拌土体的结合性

E.搅拌土体的和易性

（）不是金融资产。

A.永久性债券

B.商业票据

C.可转换债券

D.股价指数

在我国，最常见的细菌性痢疾的病原菌是

A．志贺痢疾杆菌

B．宋内痢疾杆菌

C．福氏痢疾杆菌

D．鲍氏痢疾杆菌

E．肠炎沙门菌

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.

（55）是（）

A. Permanent Circuits

B. Permanent Virtual Circuits

C. Switched Virtual Circuits

D. Switched Circuits

有如下程序：#includeusing namespace std；class Base{public：void output(){cout<output()；ptr->Print()； delete ptr；return 0；) 程序的输出结果是

A．IB

B．iD

C．2B

D．2D