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【多选题】
以下哪些属于正投影的特性?
A.
积聚性
B.
类似性
C.
重合性
D.
垂直性
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参考解析：
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【单选题】听力原文：W: Tom, could I bother you for a moment? I need someone to return this book to the library for me. M: That's no bother at all. I'm on my way there now. Q: What will the man probably do? (19)
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【单选题】听力原文：W: Tom, could I bother you for a moment? I need someone to return this book to the library for me. M: That's no bother at all. I'm on my way there now. Q: What will the man probably do next? (17)
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【简答题】一个系统能够接收的频率是有限的,人们把系统能够接受的从最低频率到最高频率之间的范围称为系统的()。
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【单选题】听力原文：W: Tom, could I bother you for a moment? I need someone to return this book to the library for me. M: That's no bother at all. I'm on my way there now. Q: What will the man probably do next? (17)
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