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【单选题】
空间平行的两直线，其投影特征为（）A.
正平面平行于水平面
B.
两直线的水平投影平行
C.
两直线的同面投影相互平行
D.
三面投影相互平行
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A.
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【单选题】There is ____ universal concept among ____ parents that the more they feed their kids, the healthier they will grow up to be.
A.
an, the
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a, the
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a, /
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/, the
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