[tex=36.143x1.286]chEAazo7ok9LIBeEl1NYk+NFvNbPJhwbRf6o/D2PYGzh8pXWFrIEaGPmAWGxlXG3wTc2sL8bbVkyV22RzAoKcCCiGq1GywiMV0tU3AMo7CdQjeVkp26eAG8z0cgboIrl//TUrQpSCnRlWGTBZlwZ5lU6zEFFwkgzNj7bNxGTTy4=[/tex][tex=10.286x1.286]pCXldShc3/q+0+d0pRhjJzZ2djJvuA3NLxMrvjkGPRkKzt05a4i7Ht1CAFDSzfqE[/tex]

[tex=36.143x1.286]8cqux6lz+do4Jttr1V0088QhiQ+/Sa13zBo4zmw2aFByQf++g/FPpx4tIdjTeZ1/V5mbrB2efv+eHh46ffLNhKt7BhGGn1H/AR0yn5N8L+JemkSTX6P49GlD95wqICZ2ED1SN1w29Wu4qOqOHfUpJTugpqksoSxWDlGKZ/LcIG4=[/tex][tex=14.5x1.286]X+Jd6+OaH/+mydHVZ9l6H0LXoBuxQMDgf7zW4iQ//Xe2CNNLfdeTLzhAz85Yu88FZxzSz8HzL/rwVT4UPYJxRyCOEEEoRGv6ZeZrBIeEuPk=[/tex][img=255x153]179c026a19d8b0f.png[/img]

[tex=32.214x1.286]ZCdaOYI7cJqUAJoluXWiMPebJkycPvgcru0+q+Qrx0lhXxX02UgAWHWL7zdwoBbSCTZXtIEIAEUKLmtO4znNqJyBVb4ghQAUvEqRXoSIiQvnVqvpVwzdVWzk2w1xxgq4UlV8iK/TLQHMgNQYUyMzbA==[/tex][tex=33.857x1.286]Skn/1d16Hm6QdSRSvQDaARlI5eCg006bx+BnALBYi26z3Taj1KPqjeRp3sPGKtVFx2eAjZ9ecJefGN9CK9RqU9UrpH7jTwDuWka23K+3DhQNOMd8lgGk+LbEiEEu2CNWEzJZb2lYuW1o2upAeYKctuRwAIQ4IOJ2nfaQlb3rc1U=[/tex][tex=36.643x1.286]fqS2JCxwFfXMJW6sYEzyfuHZC8CKAi6Gc8FoM94Jf0uclPUdkUPH0PGS6/Hu0RaRvZbpAOBC3l7rOQFKqFr5jvu7tymrniJXd+VALWF42YWqfeFTstD0YBKGVs5Wz3lBHSVVhhD4168A0zu9GGNANA==[/tex][tex=36.143x1.286]t+Ikrw9yovjqD20agaQVCPK0ErJRzexJHkJDE2zUa4AmoLF6Y2F18FK+J7uZ4Q/8SNxaLtQhez4F8QXJqQh4JoNYy4bOPPgsMuuDgoCk0xWLFdDj9HCVFRXD6T36/13UsVmWZsMXYlOTfPEuFtIGyzOfO05R24bfRBn0win3ucM=[/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

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)

判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(￢A(x)∨B(x)) ⇔(∀x)￢( A(x)∧￢B(x) ) ⇔￢(∃x) ( A(x)∧￢B(x) ) ⇔￢( (∃x)A(x)∧(∃x)￢B(x) ) ⇔￢(∃x)A(x)∨￢(∃x)￢B(x) ⇔￢(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)

以下谓词公式中，( )不是逻辑有效式。 A: ($x)(P(x)∧Q(x)) Þ ($x) P(x)∧($x) Q(x) B: ("x)(P(x)∧Q(x)) Þ ("x) P(x)∧("x) Q(x) C: ($x)(P(x)∧Q(x)) Û ($x) P(x)∧($x) Q(x) D: ("x)(P(x)∧Q(x)) Û ("x) P(x)∧("x) Q(x)