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【单选题】
在802.11中采用优先级来进行不同业务的区分,优先级最低的是( )A.
服务访问点轮询
B.
服务访问点轮询的应答
C.
分布式协调功能竞争访问
D.
分布式协调功能竞争访问帧的应答
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反馈参考答案：
举一反三
【判断题】一般管理员用户发现金融监管部门查询用户未按照规定查询信用信息的， 将查询的信息用于本单位业务之外的， 有权停止其查询权限，同时通知查询用户所在部门()。
A.
正确
B.
错误
【单选题】It can be learned from Paragraph 4 that______.
A.
people nowadays communicate less with their physical neighbours
B.
people interact more often with those nearby than those faraway
C.
neighbourhoods are becoming more heavily populated
D.
a digital form. of neighbourhood has come into being
【简答题】We can infer from the text that the employees of the enterprise______. [A] would start their work by listening to a joke [B] were cold to newcomers [C] were always punctual for work [D] lacked devotio...
【简答题】已知用户表信息如下: 按要求写出对应的SQL语句 1、查询用户名为sqdd的用户信息 2、查询所有管理员的信息 3、查询用户名为sqdd,密码为1234的用户信息
【单选题】已知集合A={x|（x-1）（x-5）＜0}，B={x|log 2 x≤2}，则集合A∩B=（ ）
A.
{x|0＜x＜4}
B.
{x|0＜x＜5}
C.
{x|1＜x≤4}
D.
{x|4≤x＜5}
【简答题】IEEE 802.11 MAC层的帧分为数据帧、 和控制帧。
【单选题】It can be inferred from the passage that ______.
A.
Americans' character is affected by their social and geographical environment
B.
Americans want to participate in all kinds of activities
C.
curiosity is characteristic of Americans
D.
Americans do not know how to deal with silence
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