用比色法测定摩尔质量为100的某物质,测得百分吸光系数为100,其摩尔吸光系数是()
A.100
B.500
C.1000
D.1500
E.2000
参考答案:C
For a vessel with list,a decrease in GMT will cause the inclination to().
A.stabilize at an angle of loll
B.decrease
C.increase
D.remain constant
在窗体上画一个列表框、一个命令按钮和一个标签。程序运行后,在列表框中选择一个项目,然后单击命令按钮,即可将所选择的项目删除,并在标签中显示列表框当前的项目数,运行情况如图6-1所示。下面是实现上述功能的程序,请填空。 Private Sub Form_Load( ) List1.AddItem "AAAAA" List1.AddItem "BBBBB" List1.AddItem "CCCCC" List1 .AddItem "DDDDD" End Sub Private Sub Command1_Click( ) Dim L1 As Integer L1 = If L1 > = 0 Then List1.RemoveItem______ Label1.Caption = Else MsgBox"请选择要删除的项目" End If End Sub