①若2×4n×8n=211,则n=______; ②若10m=5,10n=3,则102m-3n=______.
①若2×4n×8n=211,则n=______; ②若10m=5,10n=3,则102m-3n=______.
在温度为0 ℃时,水的表面张力为( )。 A: 6.11×102 N/m B: 6.5×102 N/m C: 7.0×102 N/m D: 7.58×102 N/m
在温度为0 ℃时,水的表面张力为( )。 A: 6.11×102 N/m B: 6.5×102 N/m C: 7.0×102 N/m D: 7.58×102 N/m
有如下程序: Dim a(3,3)As Integer For m = 1 To 3 For n = 1 To 3 a(m,n)=(m-1)*3+n Next n Next m For m = 2 To 3 For n = 1 To 2 Print a(n,m); Next n Next m 运行后,输出结果是( )。
有如下程序: Dim a(3,3)As Integer For m = 1 To 3 For n = 1 To 3 a(m,n)=(m-1)*3+n Next n Next m For m = 2 To 3 For n = 1 To 2 Print a(n,m); Next n Next m 运行后,输出结果是( )。
下列各组量子数中哪一组是正确的 A: n=3,l=3,m=3 B: n=3,l=2,m=3 C: n=3,l=2,m=2 D: n=3,l=1,m=﹣2
下列各组量子数中哪一组是正确的 A: n=3,l=3,m=3 B: n=3,l=2,m=3 C: n=3,l=2,m=2 D: n=3,l=1,m=﹣2
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
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
下列各组量子数,正确的是( ) A: n = 3,l = 2,m = 1 B: n = 3,l = 1,m = 2 C: n = 3,l = 0,m = 1 D: n = 3,l = 3,m = 1
下列各组量子数,正确的是( ) A: n = 3,l = 2,m = 1 B: n = 3,l = 1,m = 2 C: n = 3,l = 0,m = 1 D: n = 3,l = 3,m = 1
程序段: int m,n; m=15,n=12; while(m!=n) { while(m>n)m-=n; while(m 3
程序段: int m,n; m=15,n=12; while(m!=n) { while(m>n)m-=n; while(m 3
下列各组量子数中,那一组是正确的( ) A: n = 3, l =1, m =1 B: n =3, l =1, m = 2 C: n =3, l =1, m =-2 D: n =3, l =3, m =-3
下列各组量子数中,那一组是正确的( ) A: n = 3, l =1, m =1 B: n =3, l =1, m = 2 C: n =3, l =1, m =-2 D: n =3, l =3, m =-3
以下量子数取值合理的是 A: n = 1, l = 1, m = 0 B: n = 2, l = 0, m = 1 C: n = 3, l = 3, m = 3 D: n = 4, l = 3, m = -2
以下量子数取值合理的是 A: n = 1, l = 1, m = 0 B: n = 2, l = 0, m = 1 C: n = 3, l = 3, m = 3 D: n = 4, l = 3, m = -2
下列各组量子数合理的是 A: n = 3,l = 2,m = 3 B: n = 2,l = 4,m = 1 C: n = 4,l = 1,m = 2 D: n = 3,l = 3,m = 1
下列各组量子数合理的是 A: n = 3,l = 2,m = 3 B: n = 2,l = 4,m = 1 C: n = 4,l = 1,m = 2 D: n = 3,l = 3,m = 1