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【单选题】
防火墙用于将因特网和内部网络隔离,( )。
A.
是防止因特网火灾的硬件设施
B.
预报可反映出信息的时效性
C.
是保护线路不受破坏的软件和硬件设施
D.
是抗电磁干扰作用的硬件设施
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举一反三
【单选题】Ireland is divided into two political parts as
A.
Northern Ireland and Southern Ireland.
B.
Southern Ireland and the Republic of Ireland.
C.
The Republic of Ireland and Northera Ireland.
D.
Northern Ireland and Britain.
【单选题】Ireland is divided into two political parts: _______ .
A.
Northern Ireland and southern Ireland
B.
Southern Ireland and the Republic of Ireland
C.
the Republic of Ireland and Northern Ireland
D.
Northern Ireland and Britain
【单选题】Ireland is divided into two political parts: _______.
A.
Northern Ireland and Southern  Ireland
B.
Southern Ireland and the Republic of Ireland
C.
the Republic of Ireland and Northern Ireland
D.
Northern Ireland and Britain
【多选题】Ireland is divided into three geographical regions including______.
A.
the Wild Atlantic Way
B.
Ireland’s Hidden Heartlands
C.
Ireland’ Capital Area
D.
Ireland’s Ancient East
E.
Western Ireland
【简答题】圆柱的轴截面是宽为__,长为__的矩形。
【多选题】In term of tourism, Ireland is divided into the following three geographical regions______.
A.
Ireland’s Hidden Heartlands
B.
Ireland’ Capital District
C.
The Wild Atlantic Way
D.
Ireland’s Ancient East
【判断题】操作系统是计算机最基本的系统软件
A.
正确
B.
错误
【单选题】video.mp4 Ireland is divided into two political parts: ( ) .
A.
Northern Ireland and Southern Ireland
B.
Southern Ireland and the Republic of Ireland
C.
The Republic of Ireland and Northern Ireland
D.
Northern Ireland and Britain
【单选题】地球上资源很丰富,是因为地球表面有四分之三的面积被水覆盖,地球上淡水资源又很不充裕,是因为地面淡水量不到总水量的1%,因而海水淡化问题已成为科学家研究的主要方向.若实行海水淡化作为饮用水,下列方法和原理完全不可能的是(  )
A.
利用太阳能,使海水蒸馏淡化
B.
加明矾,使海水中的盐分沉淀并淡化
C.
将海水通过离子交换树脂,以除去所含的盐分
D.
利用半透膜,采用反渗透法使海水淡化
【单选题】一个圆柱的底面是半径为3的圆,轴截面是一个宽为4,长为6的矩形,则该圆柱的体积为()
A.
24
B.
36
C.
12
D.
18
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