某色谱柱子上，苯和奈的保留时间和半峰宽分别为4.65和7.39 min、0.158和0.228 min；求柱效果和分离度。 A: n(苯)=4.80x10^3 /m, n(萘)=5.82x10^3 /m, R=8.36 B: n(苯)=3.80x10^3 /m, n(萘)=4.80x10^3 /m, R=6.26 C: n(苯)=4.00x10^3 /m, n(萘)=5.00x10^3 /m, R=8.36 D: n(苯)=4.50x10^3 /m, n(萘)=5.23x10^3 /m, R=4.36 E: n(苯)=2.80x10^3 /m, n(萘)=5.35x10^3 /m, R=6.86

用符号“∈”或“∉”填空：（1）−3 N，0.5 N，3 N；（2）1.5 Z，−5 Z，3 Z；（3）−0.2 Q，π Q，7.21 Q；（4）1.5 R，−1.2 R，π R．

有以下程序 void f(int n, int *r) { int rl=0; if (n%3==0) r1=n/3; else if(n%5==0) r1=n/5; else f(--n, &r1); *r=r1; } main( ) { int m=7, r; f(m,&r); printf("%d", r); } 程序运行后的输出结果是( ).

已知全集U=R,N={x|–3 A: {x|–3

下面的函数哪些是一对一函数，哪些是一一对应函数：(1)f：N→R，其中f(n)=log10n+1；(2)f：N→R，其中(3)f：R→R，其中f(r)=2r+15

、-3不属于：（ ） A: Q B: R C: N D: Z

3 Complete the words. ► h a i r hair 1 c_ _n ____

已知\(n\)阶矩阵\(A,B\),满足\(AB = 0\)，若\(R(A) = n - 2 \),则下列正确的是（ ） A: \(R(B) \le 2 \) B: \(R(B)=2\) C: \(R(B)=3\) D: \(R(B)=1\)

设A为m×n矩阵，B为n×，n矩阵，若AB=E，则( ) A: r(A)=m，r(B)=m B: r(A)=m，r(B)=n C: r(A)=n,r(B)=m D: r(A)=n，r(B)=n

求给定自然数m和n的最大公约数。请完善程序。 Private Sub Command1_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r Do r = m Mod n m = n n = r Loop Until__________ Text3.Text = m End Sub Private Sub Command2_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r r = m Mod n Do Until _______ m = n n = r r = m Mod n Loop Text3.Text =____ End Sub Private Sub Command3_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r Do r = m Mod n m = n n = r Loop While________ Text3.Text =______ End Sub Private Sub Command4_Click() Dim m As Integer, n As Integer, r As Integer m = Text1.Text n = Text2.Text If m < n Then r = m: m = n: n = r r = m Mod n Do While______ m = n n = r r = m Mod n Loop Text3.Text =____ End Sube73f1fd63959cc8362d8c82d419c2353.png