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【单选题】
砖块排列应遵循内外搭接，上下错缝的原则，错缝的长度一半不应小于（ ）mm，砌时不应使墙体出现连续的通缝，否则将影响墙的强度和稳定性。A.
60
B.
80
C.
100
D.
200
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举一反三
【单选题】No sooner _____ the boy fall into the pond than he ____ to his feet and went to the rescue.
A.
he had seen… jumped
B.
had he seen… jumped
C.
has he seen… is jumped
D.
did he see… had jumped
【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)
【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】Hardly ______ he entered the classroom when the rain began to fall in big drops.
A.
he has
B.
has he
C.
he had
D.
had he
【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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