I always keep a(n) ____in the boot of my car.
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You may need to use ____to pick up the pieces from the wound.
Tu Youyou received the Nobel Prize in Medicine for discovering ____in 2015.
与（）面平行的空间直线称为水平线。
A. 无法确定
B. H
C. V
D. W
水平线的（）面投影反应实长。
A. H
B. W
C. V
D. 无法确定
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