• 2022-07-26
    图示铆钉连接,铆钉的挤压应力[img=22x17]1803d619f35c24f.png[/img]有如下四个答案,正确的是()[img=264x158]1803d619fe6bc6f.png[/img]
    A: [img=27x44]1803d61a0748f9e.png[/img]
    B: [img=27x44]1803d61a0fb35ae.png[/img]
    C: [img=25x44]1803d61a18a167d.png[/img]
    D: [img=27x44]1803d61a21fd54a.png[/img]
  • B

    举一反三

    内容

    • 0

      图示一铆钉连接三块厚度均为t的钢板,铆钉的直径为d。则铆钉所受切应力和最大挤压应力分别为( )。 [img=270x93]1803496ae9c8f61.png[/img] A: [img=27x44]1803496af3567be.png[/img], [img=25x44]1803496afc21b8a.png[/img] B: [img=27x44]1803496af3567be.png[/img], [img=16x44]1803496b0df16d1.png[/img] C: [img=27x44]1803496b165992e.png[/img], [img=25x44]1803496afc21b8a.png[/img] D: [img=27x44]1803496b165992e.png[/img], [img=16x44]1803496b0df16d1.png[/img]

    • 1

      独立重复地投掷一颗均匀的骰子,直到出现6点就停止投掷,设X表示投掷骰子的次数,则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da13460ecf5.png[/img][img=36x43]1803da134eadb99.png[/img][img=57x43]1803da135709664.png[/img]…[img=58x43]1803da135e5a076.png[/img]… D: X123…k…P[img=9x43]1803da13671cd55.png[/img][img=36x43]1803da13703c21c.png[/img][img=57x43]1803da1378489ec.png[/img]…[img=58x43]1803da13822269c.png[/img]…

    • 2

      独立重复地投掷一颗均匀的骰子,直到出现6点就停止投掷,设X表示投掷骰子的次数,则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803573572a7b80.png[/img][img=36x43]180357357af3976.png[/img][img=57x43]180357358399321.png[/img]…[img=58x43]180357358bf0f84.png[/img]… D: X123…k…P[img=9x43]180357359488348.png[/img][img=36x43]180357359c7d68a.png[/img][img=57x43]18035735a57969a.png[/img]…[img=58x43]18035735ae0e3f4.png[/img]…

    • 3

      独立重复地投掷一颗均匀的骰子,直到出现6点就停止投掷,设X表示投掷骰子的次数,则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da175d21bb3.png[/img][img=36x43]1803da176510759.png[/img][img=57x43]1803da176e34ee6.png[/img]…[img=58x43]1803da177747ce7.png[/img]… D: X123…k…P[img=9x43]1803da177fbaa74.png[/img][img=36x43]1803da17890c39f.png[/img][img=57x43]1803da1792a9c56.png[/img]…[img=58x43]1803da179bd7a28.png[/img]…

    • 4

      在下列命题中:如果f(x)=[img=28x44]17e0bf9914bb2f1.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0;如果f(x)=[img=28x44]17e0bf992111a1c.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0;如果f(x)=[img=55x44]17e0bf992d8de0a.png[/img],那么[img=29x29]17e0bf9939482bb.png[/img]f(x)不存在;如果f(x)=[img=87x53]17e0bf99450fa82.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0。其中错误命题的个数是( A: 0 B: 1 C: 2 D: 3