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【简答题】
小在做“探究凸透镜成像规律”实验： （1）成像出现了如图所示的问题。解决的方法是把凸透镜往 调，使中心、透镜、光屏在同一高度。（填“上”或“下”） （2）根据实验记录，绘制了物体离凸透镜的距离u跟实像到透镜的距离v之间的关系图像（如图），则此凸透镜的焦距为 ㎝。 （3）将物体由距凸透镜40cm处匀速移动到20cm处,所用的时间为2s，物体的像移动的平均速度是 m/s。
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A.
Use # as the start and end of a comment paragraph.
B.
Use ' as the start and end of a comment paragraph.
C.
Use '' as the start and end of a comment paragraph.
D.
Use ''' as the start and end of a comment paragraph.
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Manually type your name into each comment
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Click File > Options and type a different User Name and Initials
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Click the Change User button on the Home tab
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Click the Manage Comments button on the Review tab
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Use % as the start of a comment line.
B.
Use # as the start of a comment line.
C.
Use * as the start of a comment line.
D.
Use & as the start of a comment line.
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