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【单选题】
在使用和维护检影镜的过程中，须特别注意( )。A.
一定温度，一定湿度，防尘，防震，防摔
B.
一定温度，一定湿度，防尘，防震
C.
一定温度，一定湿度
D.
防尘，防震
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A.
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【单选题】Why does the professor say this:
A.
To emphasize the point that he has just made
B.
To indicate that another point will be made
C.
To demonstrate that the point is his opinion
D.
To regain the students' attention for the next point
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