炎性充血主要是指（） A.动脉扩张，局部组织含血量增多 B.静脉回流障碍，组织含血量

下肢丹毒反复发作习导致：（）。

A.组织坏苑

B.化脓

C.象皮肿

D.败血症

E.脓血症

Documentation of a software package is normally produced for two purposes．One is toexplain the (71) ofthe software and describe how to use them．This is known as (72) because it is designed to be read by the user of the software．The other purpose ofdocumentation is to describe the software’s internal composition SO that the system can bemaintained later in its life cycle．Documentation of this type is known as (73) ．

A．system documentation

B．user documentation

C．vender documentation

D．product documentation

汽包压力将达到（）时要及时放散。

A.0.6MPa

B.0.7MPa

C.0.8MPa

关系数据库中的表不必具有的性质是（）。

A、数据项不可再分

B、同一列数据项要具有相同的数据类型

C、记录的顺序可以任意排列

D、字段的顺序不能任意排列

简述班集体的教育功能。