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请你说明关贸总协定的基本原则是什么。

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牙周病最有效的预防措施有()

A. 定期洁治,养成良好的口腔卫生习惯
B. 盐水漱口,使用药物牙膏
C. 改变偏侧咀嚼习惯
D. 定期调,去除拾创伤因素
E. 牙龈翻瓣手术

下列事件过程的功能是:建立一个名为Datal的随机文件,存放角度值及这些角度的正弦函数值和余弦函数值,角度为1,2,3,…,90。请在空白处填入适当的内容,将程序补充完整。 Private Type Ang K As Integer Sinx As Single Cosx As Single End Type Dim Ksc As Ang Private Sub Form_Click() Dim Y As Single Dim i As Integer Dim Ksc As Ang Open______ Y=3.14159/180 For i=1 To 90 Ksc.K=i Ksc.Sinx=Sin(i*Y) Ksc.Cosx=Cos(i*Y) ______ Next i Close #2 End Sub

A. "..\Data1.txt"For Random As #1 Len=10 Put #1,i,Ksc
B. "..\Data1.txt"For Random As #1 Len=10 Put #1,Y,Ksc
C. "..\Data1.txt"For Random As #1 Put #1,i,Ksc
D. "..\Data1.txt"For Random As #1 Put #1,Y,Ksc

已知变量boo1Var是一个布尔型的变量,如果要给其赋值为True,则正确的赋值语句是______。

怎样培养学生的良好性格

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