• 2022-06-03 问题

    为什么f(36)等于f(4*9)等于f(4)加f(9)

    为什么f(36)等于f(4*9)等于f(4)加f(9)

  • 2022-06-07 问题

    听录音,选出词尾s发/s/音的单词。Listen and choose the words with anssound/s/ at the end.The car ran out of gas. A: The B: car C: ran D: out E: of F: gas

    听录音,选出词尾s发/s/音的单词。Listen and choose the words with anssound/s/ at the end.The car ran out of gas. A: The B: car C: ran D: out E: of F: gas

  • 2022-06-08 问题

    freight car(s) / passenger car(s)A A _______________ seals a brake pipe.B Brake pipes are connected by a _________________.

    freight car(s) / passenger car(s)A A _______________ seals a brake pipe.B Brake pipes are connected by a _________________.

  • 2022-05-26 问题

    以下的xml文档片段中,属性符合XML语法规则的是()。 A: <car name=”zhang’s car”> B: <car name=’zhang”s car’> C: <car name=’jieda car ”> D: <car name=jieda >

    以下的xml文档片段中,属性符合XML语法规则的是()。 A: <car name=”zhang’s car”> B: <car name=’zhang”s car’> C: <car name=’jieda car ”> D: <car name=jieda >

  • 2022-06-07 问题

    – Which is the car he drives? --- It’s _________. A: cart fifty-four B: the fifty-four car C: fifty-four car D: the fifty-fourth car

    – Which is the car he drives? --- It’s _________. A: cart fifty-four B: the fifty-four car C: fifty-four car D: the fifty-fourth car

  • 2022-05-29 问题

    给定关系 R(A,B,C,D)和关系 S(A,C,D,E,F),对其进行自然连接运算 R∞S 后的属性列为()个;与σR.C>S.F(R∞S)等价的关系代数表达式为(请作答此空) A: σ3>9(RxS) B: π1,2,3,4,8,9(σ1=5∧3=6∧4=7∧3>9(R×S)) C: σ'3'>'9'(R×S) D: 1,2,3,4,8,9(σ1=5∧3=6∧4=7∧'3'>'9'(R×S))

    给定关系 R(A,B,C,D)和关系 S(A,C,D,E,F),对其进行自然连接运算 R∞S 后的属性列为()个;与σR.C>S.F(R∞S)等价的关系代数表达式为(请作答此空) A: σ3>9(RxS) B: π1,2,3,4,8,9(σ1=5∧3=6∧4=7∧3>9(R×S)) C: σ'3'>'9'(R×S) D: 1,2,3,4,8,9(σ1=5∧3=6∧4=7∧'3'>'9'(R×S))

  • 2022-05-28 问题

    已知CaF2的Ksp=2.7×10-11,在pH =2.00时,其溶解度计算式为( )。 A: s=(Ksp)1/3; B: s=(Ksp/4)1/3; C: s=(Ksp•αF(H)2/4)1/3; D: s=(Ksp•αF(H)/4)1/3; E: s=(Ksp•αF(H)2/4)1/2; F: s=(Ksp)1/2; G: s=(Ksp/4)1/2。

    已知CaF2的Ksp=2.7×10-11,在pH =2.00时,其溶解度计算式为( )。 A: s=(Ksp)1/3; B: s=(Ksp/4)1/3; C: s=(Ksp•αF(H)2/4)1/3; D: s=(Ksp•αF(H)/4)1/3; E: s=(Ksp•αF(H)2/4)1/2; F: s=(Ksp)1/2; G: s=(Ksp/4)1/2。

  • 2021-04-14 问题

    已知F(s)= 4/(2s^2+3s),则f(t) = ()

    已知F(s)= 4/(2s^2+3s),则f(t) = ()

  • 2022-06-09 问题

    I don’t use Kart’s car because I don’t quite appreciate _______. A: that car of him B: that car of his C: that car D: his that car

    I don’t use Kart’s car because I don’t quite appreciate _______. A: that car of him B: that car of his C: that car D: his that car

  • 2022-06-12 问题

    What is the core of a car’s engine?

    What is the core of a car’s engine?

  • 1 2 3 4 5 6 7 8 9 10