Q1: What will Isabelle get for her birthday?
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Q2: Will she love the birthday present that her parents bought for her?
Q3: How to express uncertainty according to the video clip?
点的主视图投影与俯视图投影的连线与( )坐标轴垂直。
A. X
B. Y
C. Z
点的主视图投影与左视图投影的连线与( )坐标轴垂直。
A. X
B. Y
C. Z