代号为P.Ⅰ和P.Ⅱ的硅酸盐水泥在组分上有什么区别?
代号为P.Ⅰ和P.Ⅱ的硅酸盐水泥在组分上有什么区别?
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窗体上有两个名称分别为Text1、Text2的文本框,一个名称为Command1的命令按钮。设有如下的类型声明: Type Person name As String*8 major As String*20 End Type 当单击“Command1”按钮时,能够正确地把数据写入文件的程序段是______。A.Private Sub Command1_Click() Dim p As Person p. name=Text1. Text p. major=Text2. Text Open"C:\data. dat" For Random As #1 Put #1, 1, p Close #1 End SubB.Private Sub Command1_Click() Dim p As Person p. name=Text1.Text p. major=Text2. Text Open"C:\data. dat" For Random As #1 Get #1, 1, p Close #1 End SubC.Private Sub Command1_Click() Dis p As Person p. name=Text1. Text p. major=Text2. Text open "C:\data. dat" For Random As #1 Len=Len(p) Put #1, 1, p Close #1 End SubD.Private Sub Command1_Click() Dim p As Person p. name=Text1. Text p. major=Text2. Text Open "C:\data. dat" For Random As #1=Len(p) Get #1, 1, p Close #1 End Sub
单选题The train leaves at 6:00 p. m., so I have to be at the station _____ 5:00 p. m. at the latest.AuntilBafterCbyDaround
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