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与V面平行的直线，称为______。

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IEEE802.11的MAC层采用的是______的冲突避免方法。

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正平线的______投影反映直线的实长。

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The software architecture of a program or computing system is the structure or structures of the system, which comprise software, the externally properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a that enables a so, ware engineer to: analyze the of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the __ associated with the construction of the software.

A. quality
B. budget
C. schedules
D. risks

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在窗体上画一个名为Text1的文本框和一个名为Command1的命令按钮。要求：程序运行时，单击命令按钮，能将事先输入到文本框中的内容一个字符一个字符地写入顺序文件Test.dat中，如图所示。请在空格处填上适当的内容，则在以下横线处合适的语句是( )。 Private Sub Command1_Click() Open "c:\test.dat"For______As#1 For i=1 To Len(Text1.Text) Next i Close #1 End Sub

A. Input Print#1,Mid(Text1.Text,i,1)
B. Output Print#1,Mid(Text1.Text,i,1)
C. Output Print#1,Left(Text1.Text,i,1)
D. Output Input#1,Mid(Text1.Text,i,1)

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