[tex=36.929x1.286]9/dp9aAo6LIa2iwMXRtTgyprikANdnte3+CUjIGesWWNtykaTS44fZprxcXs9YwIMqZ30Skk8EoK5yhAVysRH26wHHIclEfqBvx0vPLZYrjHtYXmYNVVV8FkNzMFXkQsAIR/9mOmk53gJVEYZIbix+YjeMK8tA32UO/B/z9FT0I=[/tex][tex=36.929x1.286]9/dp9aAo6LIa2iwMXRtTgyprikANdnte3+CUjIGesWWNtykaTS44fZprxcXs9YwIMqZ30Skk8EoK5yhAVysRH26wHHIclEfqBvx0vPLZYrjHtYXmYNVVV8FkNzMFXkQsAIR/9mOmk53gJVEYZIbix+YjeMK8tA32UO/B/z9FT0I=[/tex]

[tex=34.286x1.286]PaLvrGZMJfhx2N+b9VH7sE0b6/uxwyiM3TWWD7kFutl9PX74APAu8DA8EE0ZoqXeQjmEx85UwcNnmtLQN/1C+Et4tzLDqd20FlTt7IZR5sBNOCH67x3axhkskfZXd2RKhMfmtN/bas/fACfWJhJCWg==[/tex][tex=36.929x1.286]D1f+aR5rDSzRJS3vfw2g/8kLoauHvMW1r8zJAXH8ikGWdW/2CiJiS/89QHYOd/6degjX/qlGOU+wN+OJCi0nzFP0I5SfgR7x/M67TVYCmt6SaoWQnnrblfUrw0i9iMQE+2SfKTgPfF5n+HA5N9YMNua7OeqhU5+8tn2PvKD7gLI=[/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

[tex=36.214x1.286]dQWqUNMLEeg3VtYQAJBf1Es8v3eBBRIy0iJYsvjOw6MNZXa4V0WfaIPc4dY+T+eLSkCa0yPp88HrKzTRYnGB+YhOABGxdxbO9R/weV1BFo505FWPYWxit8TtYHIuawTaAhKSUcxW6tKMmazYqYvXWY2qAnYbGkh4CahFnb1Teveq6JWbq+xxGn/Oyl40aQUX[/tex][tex=36.929x1.286]mL1J7988s9UYTTVmu9bB+u3IOFD5MNCdRyx8+hHZjFotZD3GfXrut6uqOXFDAmC/aGqDhGC6kR6juz0u5FnTeJMGZYmJpk+Uq68543S5mn7YPuKsR019j877H+0JtcXTK+PezG0eB68vhg3+d2odY5xix5ivquabd3CwagOfq3k=[/tex][tex=39.071x1.286]gkOuoiL9KtaGYxdAeKMK1RD/aImz6qALYCGXBt5FH3Yhq9HFJIy86by/KYnFa7yHd1h/bChn5lzqgNw1L1RKiP2gyFbJO8gUmEcgUW9VPZxerFyNoKInw2Yf4GiysSexZb9aRqvo6+018lqruK+xTzPPaPG1r+ouJlU2fGKSj3MdimRoZK0CRt60OCCcb0Am[/tex][tex=37.714x1.286]gkOuoiL9KtaGYxdAeKMK1RD/aImz6qALYCGXBt5FH3Yhq9HFJIy86by/KYnFa7yHd1h/bChn5lzqgNw1L1RKiIhLQ0ZtAIXjol9YCY9usVKrZPSICE3QU4HlKelYqtiAHI7rqRrZr/BHkZWkmLgG0ddsnYkltr1b3R9/Zj0nVYE=[/tex][tex=33.071x1.286]s7myUtb9tai5d4r8kdln55UmXQdsW217/D9hNxPKHfaDBrfYhO5f9eDCgyWL3+oUGNbFro9BudeEPv3Vz/wLcbdp0bRRitkvt3fhCm6pIF+yvzextfxqdpFpzb7zuEvpY99lJULCi8hdkMZOmgZ47A==[/tex]

对某铁矿的含铁量进行10次测定，得到以下结果:[tex=36.929x1.286]v1Yz2vwMqvs9mFT5jyfl9ZVgSTvAGR4TgA1Arx0FW7iolHE/SFCUSCQnrSYlADFINkBpbR8EIaPjR7Giipw0ECwCGcCdehbKdZ4yw4ZFBdktjRQRWu/ItbA3OFBUkTL0A4BHYjSUSofFn2+ol8/LRw==[/tex],试用[tex=0.857x1.214]ChdusW5rAupjge6v/DGHRA==[/tex]检验法判断有无异常值需要弃去(置信度为[tex=1.857x1.143]6ct+iwoR4UNC8as2/Ebayw==[/tex])?

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)