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[tex=19.143x1.286]zorA2ZbmbCjdf/FhpwxVLoAfK/5uuzWuMtixzA3skd1w4OUNwY+rwzu0VHg2l7ndPrkAoty2Fs+POJn/7/F2Q+gDB4m/jdDDdf7e0gSKgBQ=[/tex][tex=30.357x1.286]miOs6gCzn4yHHToLk7EPtlTQuiW7iLcJk13vwrBtfOnf4d2rNSxQMj4LuDNeYYyLwTH2ihPSlCLzGr2XhpWHieo+oOIm1T+vJazC5EbZINk=[/tex]

若[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]独立，证明[tex=19.143x1.286]NpVA38FZm94Nc/MNwvL8w8SoZ+pJnmEA8X0PISXKPg7Y8hNmBllpKcNorgYuDSrh[/tex]。

下列选项为某变速器一、二、三、四挡的传动比，则三挡的传动比为（）。 A: 0.969 B: 1.286 C: 1.944 D: 3.455

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[tex=19.143x1.286]/WBrFD+3p/w3f8VtdDn8fSRqwyYbjy1stKhrTzJ8FRmVaoMmkeK1VFO9tfPJTwwtK9QcvzUIpyEk+sxumm0NOQ==[/tex] 未知类型：{'options': ['[tex=4.929x1.286]/NZWDsNNyrKggFPDvfpJAR5FUBuQ8Z5iX4Qvlyteo5Y=[/tex]', '[tex=7.857x1.286]3pWmN7FZw3NM4gJ3bibfSk0CWKQ0QKkxiLYZvfFDhwY=[/tex]', '[tex=7.714x1.286]3pWmN7FZw3NM4gJ3bibfSqOiVTal3kb5xvPikXX1yIw=[/tex]', '[tex=7.857x1.286]xHPAS+Q5lEKRTV7sSXbyBmJDxS7ca8eBD3kiytRyYek=[/tex]'], 'type': 102}

下列变量组（）是一个闭回路。 A: {x，x，x，x，x，x} B: {x，x，x，x，x} C: {x，x，x，x，x，x} D: {x，x，x，x，x，x}

以下谓词蕴含式正确的是（）: (∀x) (A(x)→B(x))=>( ∀x)A(x)→(∀x)B(x)|(∀x) (A(x)↔B(x))=>( ∀x)A(x)↔(∀x)B(x)|(∀x)A(x)∨(∀x)B(x)=>( ∀x) (A(x)∨B(x))|(∃x) (A(x)∧B(x))=>(∃x)A(x)∧(∃x)B(x)

以下谓词蕴含式正确的是（）: (?x) (A(x)→B(x))=>( ?x)A(x)→(?x)B(x)|(?x) (A(x)?B(x))=>( ?x)A(x)?(?x)B(x)|(?x)A(x)∨(?x)B(x)=>( ?x) (A(x)∨B(x))|(?x) (A(x)∧B(x))=>(?x)A(x)∧(?x)B(x)

下列式中错误的是： A: (∀x)(A(x)Úp(x)) Û (∀x)A(x)Ú (∀x)p(x) B: ($x)A(x) Ù p Û ($x)(A(x) Ù p ) C: (∀x)(A(x)ÚB(x)) Þ (∀x)A(x)Ú( ∀x)B(x) D: ($x)(A(x)ÙB(x)) Þ ($x)A(x)Ù( $x)B(x)