• 2022-06-01
    S1={1,2,...,8,9},S2={2,4,6,8},S3={1,3,5,7,9},S4={3,4,5},S5={3,5},在条件X⊆S1且X⊄S3下,X与()集合可能相等。
    A: X=S2或S3
    B: X=S4或S5
    C: X=S1,S2或S4
    D: X与S1,…,S5中任何集合都不相等
  • C

    内容

    • 0

      a<sub>l</sub>,a<sub>2</sub>,a<sub>3</sub>,a<sub>4</sub>,a<sub>s</sub>,….,a<sub>n</sub><br/>Inthesequenceofpositiveintegersabove,a<sub>l</sub>=a<sub>2</sub>=1,a<sub>3</sub>=2,a<sub>4</sub>=3,anda<sub>s</sub>=5.Ifeachtermafterthesecondisobtainedbyaddingthetwotermsthatcomebeforeitandifa<sub>n</sub>=55,whatisthevalueofn? A: 12 B: 10 C: 9 D: 8 E: 5

    • 1

      如图所示事故树的最小割集为()。[img=171x267]17d608e17919de1.png[/img] A: {x<sub>1</sub>,x<sub>3</sub>},{x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>4</sub>,x<sub>5</sub>} B: {x<sub>1</sub>,x<sub>3</sub>},{x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>5</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>} C: {x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>5</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>} D: {x<sub>2</sub>,x<sub>3</sub>},{x<sub>1</sub>,x<sub>4</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>}

    • 2

      脊髓的颈膨大和腰骶膨大对应的脊髓节段为() A: AC<sub>3</sub>~T<sub>1</sub>和L<sub>2</sub>~S<sub>3</sub> B: BC<sub>4</sub>~T<sub>1</sub>和L<sub>4</sub>~S<sub>3</sub> C: CC<sub>6</sub>~T<sub>2</sub>和L<sub>2</sub>~S<sub>2</sub> D: DC<sub>6</sub>~T<sub>1</sub>和L<sub>3</sub>~S<sub>3</sub> E: EC<sub>4</sub>~T<sub>1</sub>和L<sub>2</sub>~S<sub>3</sub>

    • 3

      脊髓的颈膨大和腰骶膨大对应的脊髓节段为()。 A: C<sub>6</sub>~T<sub>1</sub>和L<sub>3</sub>~S<sub>3</sub> B: C<sub>3</sub>~T<sub>1</sub>和L<sub>2</sub>~S<sub>3</sub> C: C<sub>6</sub>~T<sub>1</sub>和L<sub>2</sub>~S<sub>3</sub> D: C<sub>4</sub>~T<sub>1</sub>和L<sub>1</sub>~S<sub>3</sub> E: C<sub>4</sub>~T<sub>1</sub>和L<sub>2</sub>~S<sub>3</sub>

    • 4

      脊髓的颈膨大和腰骶膨大,它们相应的脊髓节段是 ( ) A: C<SUB>8</SUB>~T<SUB>1</SUB>和L<SUB>2</SUB>~S<SUB>3</SUB> B: C<SUB>5</SUB>~T<SUB>1</SUB>和L<SUB>4</SUB>~S<SUB>3</SUB> C: C<SUB>8</SUB>~T<SUB>1</SUB>和L<SUB>4</SUB>~S<SUB>3</SUB> D: C<SUB>5</SUB>~T<SUB>1</SUB>和L<SUB>2</SUB>~S<SUB>3</SUB> E: C<SUB>5</SUB>~C<SUB>8</SUB>和L<SUB>1</SUB>~L<SUB>3</SUB>