[tex=31.786x1.286]4rzCK/B5C4hWAXsaI+hoMwsLCjtsaDP34cAqHxyj4CRr5TL6aMiWaBccV9NxEaKm6nIylsutdnstLSDS1Q5jGAMULANcl+qryLMbREVIH3X8HO+0hDUchdrCJpEue30e[/tex][br][/br][tex=29.0x1.286]3PcbYEVfjLA23OwgpP+UOaQJCxZAlsd0frfUQNoZcyStNxKaaXEjw3CLF50KTCVq2lPLAksBqI0jsLET0ZHEBuUL4eVFeqCGFtDQkTRMhOQTTc0SJbZPKSX1QgrACaYh[/tex][tex=23.286x1.286]DnYVh6B46UzslskSyRQayXVHO2TudzFo7+iFCBHejR+tyNijL4K4RRPkPrQNuyHlR7sqZc4PzdqM3Yc9zvxjwUjL3rMQShrOl6ETAYgrke0=[/tex]

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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

[img=253x182]179c16d19bcac9c.png[/img]图所示回归轮系中,已知. [tex=23.286x1.286]EVE2+hLtTXbmac5ZawJIhEsfOVsYu/vaa83A6I2V8Ht1X4/itayrWFCGAxYZs6Kjqt2vaM1DVUmGQADXsdlzZxzCLCoBgcVSr2NT30WxZnc=[/tex] 各轮的压力角[tex=5.5x1.357]MerZakGVPWE653iTIwoodbD3aMO8L9V5EV1t16DwrQM48Ofo+7tPYr4v59vlHNF0[/tex]及[tex=3.429x1.071]r3Anrl6XE38lgVTaJsmutA==[/tex]。试问有儿种传动万案可供选择? 哪一种方案较合理?

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)

有关肾结核影像学检查的说法正确的是 未知类型：{'options': ['泌尿系统平片见到局限的钙化灶应与肾结石鉴别', '[tex=23.714x1.286]akLvoeEBT7jE1sjbCFc7kfnQS6fBr8x0mhb+xjxcnuKBFx6WpsALYp03iVc+WbahpmhSEvNKFlSBldpnUHeWdB2ptpj294FvY0PaDmFgek4=[/tex]', '[tex=23.286x1.286]2LQ5+l5ttUS3C1fLBTTCeH74CJAL8CESndAIfsI91uU9HdP9TlG5Il0JpzPRZJfrZ/pVLbiOsQ8NIzG4JQYBa/98GYCgD1wSc3o2253YucE=[/tex]', '[tex=30.214x1.286]uWgYSiETEbNiAp7RhQREPm/+EHkMBm82A/aTCbZ0G8xLz9GrhMW8+DN6a91dxVNTo2W1jbONEtuFHXNv3sMHYhFX8074c/8gyxcln5vshKvLD3TPzOPnnsm+8W/y6bGu8Q0J5qJFNDfpxx6NPtwzpg==[/tex]', '[tex=14.143x1.286]GBYZDFpQb+gW15K6a1d+PdZ5P7O0NOhZY2/8UtHklXpn2vvIsVBQwriZ0RMTNlZw2ZBXICIuYDElxE+q+aZ5jQ==[/tex]'], 'type': 102}

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)