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【单选题】
当空间的平面垂直于投影面时，则其在投影面上的投影（）A.
为缩小的类似形
B.
积聚成一条直线
C.
为放大的类似形
D.
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反馈参考答案：
举一反三
【单选题】There are studies indicating female with four different photopigments in a certain kind of cells have better color sensitivity than those with three different photopigments. What type of cell has the ...
A.
The rod cell
B.
The cone cell
C.
The Retina horizontal cell
D.
The photosensitive Retinal Ganglion Cells (pRGC)
【单选题】Cone cells in retina are active _____, and essential for _____.
A.
in the morning, color vision
B.
at night, color vision
C.
in the morning, detecting low levels of stimulation
D.
at night, detecting low levels of stimulation
【判断题】Each eye has approximately six million retinal cone cells. They are packed much more tightly in the center of our visual field a small region called the fovea than they are at the edges of the retina.
A.
正确
B.
错误
【单选题】若有以下定义，若int m=7,n=12，则能得到值为3的表达式是
A.
n%=(m%=5)
B.
n%=(m-m%5)
C.
n%=m-m%5
D.
(n%=m)-(m%=5)
【简答题】G41指令的含义是（）
【简答题】He’s working hard for fear that he__________. A．should fall behind B．fell behind C．may fall behind D．would fall behind
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