• 2022-05-29
    Which of the following statements is correct? ( )
    A: All items that are included in M1 are included also in M2.
    B: All items that are included in M2 are included also in M1.
    C: Credit cards are included in both M1 and M2.
    D: Savings deposits are included in both M1 and M2.
  • A

    内容

    • 0

      渐开线直齿圆柱齿轮正确啮合条件是()。 A: m1=m2=m B: α1=α2=α C: z1=z2=z D: m1=m2=mα1=α2=α

    • 1

      一对直齿圆锥齿轮的正确啮合条件是()。 A: m1=m2 B: α1=α2 C: m1=m2α1=α2 D: m1=m2=mα1=α2=α

    • 2

      设m=m1m2,且(m1,m2)=1,则φ(m)等于什么?() A: φ(m1) B: φ(m2)φ(m1) C: φ(m1)*φ(m1) D: φ(m2)*φ(m2)

    • 3

      一对渐开线外啮合斜齿圆柱齿轮的正确啮合条件是()。 A: mn1=mn2=m,αn1=αn2=α,β1=-β2 B: mn1=mn2=m,αn1=αn2=α,β1=β2 C: m1=m2=m,α1=α2=α

    • 4

      图为两台三相异步电动机M1和M2的控制电路。KM1控制电动机M1启停,KM2控制电动机M2启停,M1和M2启动停止的顺序是( )。[img=323x148]17d60856153ba16.png[/img] A: M<sub >2</sub>停止后,M<sub >1</sub>才能停止 B: M<sub >2</sub>启动后,M<sub >1</sub>才能启动 C: M<sub >1</sub>启动后,M<sub >2</sub>才能启动 D: M<sub >1</sub>停止后,M<sub >2</sub>才能停止