[tex=33.357x1.286]u/JO30sjmy6Mq1vKSa0gKaaKbKM6Mzh2ELdqZcMl1CjMVxUePEjQeMW26s/Hq0trQWZ6SR/wqqqxn7ufcjc+bSgHR1WWS6c7nsdmlRGSDi5+6D2Igbr2pW0ce8tuCDgZ8aHbh4JQpSxak7rirc/oxw==[/tex]

[tex=42.429x1.286]tRP0nTinPGSgSTyZznhTXbwXXX0TQytCsqKUalBHXdRTAPPYfLGSTiLKfDe13x/iI7NPcqWUc+engTosedKSDBLxl6sI2hCU7wCxtkeKZITkRU9zhbNsWvJO6EOTIKL7ZP5U2N3/vGdQQksCcis+yTQrw0Gpj3xgSYeowLmeLoCplOOxdOfBmmaGlxflDRLq[/tex][tex=33.357x1.286]1xbiuG8jZziVmpfEGbaW5yqt2tGLgAfQIM1ZHsF7512GJ6rN/cJc3W+Sak8Fx7azcctaAHn6797iva5KbtkWdHM8rBLAChmJBbXlXRWPtcoggizWuUOhGCdxNdWR+aOBlQEid56qdNVash6GEjcwUQ==[/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

现测得某试样中钒的质量分数结果如下:[tex=33.357x1.286]JiHbKIQ3jK/Bq61/8wwsYdmTH5jJl5bLhO07RGQIiPnc/Uzu2IAX1aB4dgd5oMWboqe4UJFgdm00dn2b1NdHqtcwE17BYooZKXjcpUVcvQNxE2iuhT03eh+RVy1I4qJvGA8asz+tbMX0DnSxe5Iyuw==[/tex]试计算:均差

现测得某试样中钒的质量分数结果如下:[tex=33.357x1.286]JiHbKIQ3jK/Bq61/8wwsYdmTH5jJl5bLhO07RGQIiPnc/Uzu2IAX1aB4dgd5oMWboqe4UJFgdm00dn2b1NdHqtcwE17BYooZKXjcpUVcvQNxE2iuhT03eh+RVy1I4qJvGA8asz+tbMX0DnSxe5Iyuw==[/tex]试计算:全距

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)