A.stem
B.suffix
C.base form
D.A or C
A.Root
B.Morpheme
C.Phoneme
D.Stem
A.inflection
B.compounding
C.conversion
D.blending
Amines(weak base)form salts with picric acid(trinitrophen01),and all amine picrates exhibit an absorption maximum at 359nm with a molar absorptivity of 1.25×104L·mol-1·cm-1. A 0.200g sample of aniline,C6H 5NH2,is dissolved in 500mL water. A 25.0mLaliquot is reacted with picric acid in a 250.0mL volumetric flask and diluted to volume. A 10.0mL aliquot of this is diluted to 100mL and the absorbance read at 359nm in a 1.0cm cell. If the absorbance is 0.425,what is the percent purity of the aniline?
A.25
B.26
C.27
D.28
设有如下程序: Option Base 0 Private Sub Form Click() Dim a Dim i As Integer a = Array(1, 2, 3, 4, 5, 6, 7, 8, 9) For i = 0 To 3 Print a(5 - i); Next End Sub 程序运行后,单击窗体,则在窗体上显示的是
A.4 3 21
B.543 2
C.6 54 3
D.7 6 54
阅读如下程序: Option Base 1 Private Sub Form Click() Dim Arr(4,4)As Integer For i=1 To 4 For j=1 To 4 Arr(i,j)=(i-1)*2+j Next j Next i For i=3 To 4 For j=3 To 4 Print Arr(j,i); Next j Print Next i End Sub 程序运行后,单击窗体,输出的结果为
A.5 7 6 8
B.6 8 7 9
C.7 9 8 10
D.8 10 8 11
阅读下列程序。
Option Base 1
Private Sub Form CliCk()
Dim x(3,3)
For j=1 to 3
For k=1 to 3
If j=k then x(j,k)=1
If j<> k then x(j,k)=3
Next k
Next j
Call fun(x())
End Sub
Private Sub fun(a())
For j=1 to 3
For k=1 to 3
Print a (j,k);
Next k
Next j
End Sub
运行程序时,输出的结果是【 】。
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