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【单选题】
在“图层”调板中按住（）键单击“添加图层蒙版”按钮可创建一个黑色的蒙版，黑色的蒙版会遮住当前图层的所有内容。相当于选取【图层】｜【图层蒙版】｜【隐藏全部】菜单命令。A.
Alt
B.
Shift
C.
Ctrl
D.
Alt+Shift
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举一反三
【单选题】There are two temperature scale, it is _____ that the freezing point is zero.
A.
Fahrenheit
B.
Celsius
C.
overcast
D.
humid
【单选题】The freezing point is the temperature ______ water changes into ice.
A.
at which
B.
on that
C.
when
D.
of which
【单选题】组织的各个部门、各个人员都是可以根据组织内外环境的变化而进行灵活调整和变动的。这是组织设计的（）。
A.
统一指挥原则
B.
控制幅度原则
C.
权责对等原则
D.
柔性经济原则
【单选题】the freezing point is the temperature _______water changes into ice a at which
A.
At which
B.
On that
C.
In which
D.
Of what
【单选题】The freezing point is the temperature __________ water changes into ice.
A.
at which
B.
on that
C.
in which
D.
of what
【单选题】以下哪项是转至文件顶部的键盘快捷键？
A.
coommand - 向上箭头
B.
coommand - 向左箭头
C.
coommand - B
D.
coommand - U
【简答题】Water is a liquid, the freezing point ______ _________ is 0’C.
【单选题】The temperature can fall to －50°C. _____ is, 50°Cbelow freezing point.
A.
Which
B.
It
C.
This
D.
That
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