下面关于USB接口的叙述中,错误的是( )。A.主机不能通过USB接口向所连接的设

题型:单项选择题

问题:

下面关于USB接口的叙述中,错误的是( )。

A.主机不能通过USB接口向所连接的设备供电

B.使用USB接口的设备通常支持热插拔和即插即用

C.从外观上看,USB连接器要比PC机并口连接器小巧

D.USB中数据传输是使用差分信号的方式来实现的

考点:计算机等级考试PC技术三级PC技术笔试304
题型:单项选择题

男性,54岁。上班时他人发现其口角歪斜,诊断为左侧面神经麻痹。

不应有的体征是 ()

A.左侧额纹消失

B.左眼裂大

C.左鼻唇沟浅

D.张口下颌向左偏斜

E.左口角下垂

题型:单项选择题
 
短文改错。
      
     Not too long ago, people can't go scuba diving on
Hainan Island, or anywhere else. This were because  
there was no machine allowing  person to breathe    
under water for long time. In 1943 Jacques
Cousteau and his friend made it possible by invent the scuba    
machine. Cousteau was very interested on diving        
deep into the sea, but wanted to be an explorer. He    
bought a ship and used them to explore under the sea.
He also was liked to make videos. As he explored
the sea, he took pictures and videos of many thing that  
people had never seen before.  
1.                                                
2.                                                
3.                                                
4.                                                
5.                                                
6.                                                
7.                                                
8.                                                
9.                                                
10.                                              
题型:单项选择题

置于水平地面上的物体,在水平拉力F作用下向前运动,当拉力F增大时,速度也随之增大,物体所受的滑动摩擦力将(   )

A.增大

B.减小

C.不变

D.不能确定

题型:单项选择题

烟气走廊的形成导致过热器的热偏差()。

A、严重;

B、减轻;

C、没有影响.

题型:单项选择题

随着计算机网络技术和规模的迅猛发展,基于web的计算模式已经成为信息系统采用的主流方式。 Web技术的发展过程大致可划分为3个阶段:静态web技术、动态Web技术和()。

A.事务Web技术

B.Web Service技术

C.移动计算技术

D.分布式Web技术

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