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【单选题】
当圆柱的轴线为侧垂线时,圆柱面的( )积聚为圆。
A.
正面投影
B.
水平投影
C.
侧面投影
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D
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【多选题】俄罗斯人常饮用的饮料有哪些。
A.
蜂蜜水
B.
格瓦斯
C.
加糖红茶
D.
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A.
Integer
B.
String
C.
Boolean
D.
Variant
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