试题与答案

设函数u(x,y,z)=x2+2xy+z2+2,则gradu(1,0,-1)=___

题型:填空题

题目:

设函数u(x,y,z)=x2+2xy+z2+2,则gradu(1,0,-1)=______.

答案:

参考答案:{2,0,-2}

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题型:单项选择题

设在工程中定义了下列类型: Type Stutype ino As Integer strname As String*20 strsex As String*1 smark As Single End Type 在窗体上正确使用这个类型的是下列哪个操作( )。

A.Sub Command1_Click() Dim student As Stutype With student .ino=12 .Strname=smith .strsex=男 .smark=89 End With End Sub

B.Sub Command1_Click() Dim Student As Stutype With student .ino=12 .strname="smith" .strsex="男" .smark=89 End With End Sub

C.Sub Comnland1_Click() Dim student As Stutype With Stutype .ino=12 .strname="smith" .strsex="男" .smark=89 End With End Sub

D.Sub Command1_Click() Dim student As Stutype With student .ino=12 .Strname="smith" .strsex="男" .smark=89 End student End Sub

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