• 2022-05-30
    师徒加工一批零件,师傅每小时做m个,徒弟每小时做n个。3小时候他们一共做()个。
    A: 3m+n
    B: m+3n
    C: 3m+3n
  • C

    内容

    • 0

      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

    • 1

      师徒两人加工一批零件,由师傅单独做需37小时,徒弟每小时能加工30个零件,现由师徒两人同时加工,完成任务时,徒弟加工的个数是师傅的5/9,这批零件共有()个。 A: 2060 B: 2004 C: 1998 D: 2001

    • 2

      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(  )。

    • 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

    • 4

      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