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【单选题】
涉及焓的下列说法中正确的是A.
单质的焓值均等于零
B.
在等温过程中焓变为零
C.
在绝热可逆过程中焓变为零
D.
化学反应中系统的焓变不一定大于热力学能变化
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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】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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