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【单选题】
下面命令的作用是? chmod u+r abc.txt
A.
为abc.txt文件添加所有用户可读权限
B.
为abc.txt文件添加同一个组用户的可读权限
C.
为abc.txt文件添加文件拥有用户的可读权限
D.
为abc.txt文件添加其他用户的可读权限
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A.
wait in line
B.
cut in line
C.
jump the line
D.
got excited
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A.
正确
B.
错误
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【单选题】下边注音、解释全对的一项是( )
A.
不积跬(guǐ半步)步;蟹六跪而二螯(áo蟹钳)
B.
B骐骥(qí jì骏马);一跃(yào跳)
C.
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D.
锲(qiâ刻)而不舍;金石在镂(lîu雕空)
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A.
正确
B.
错误
【单选题】温度高的地方比温度低的地方,气压随高度降的
A.
B.
C.
快慢一样
【判断题】单击图层左侧的 图标,出现 符号,表示此层与当前层链接,成为一个链接层,当移动当前层中的图像时,所有处于链接层中的图像都被一起移动
A.
正确
B.
错误
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