下列广义积分发散的是[input=type:blank,size:4][/input] 未知类型：{'options': ['[tex=4.071x2.714]wJGaTThFo41W0bFf87CfUuugd6DBIP+tJAZROWCVe0nLvd/LRaOfDe9Z/pN1FZhM[/tex]', '[tex=5.0x2.786]wJGaTThFo41W0bFf87CfUuugd6DBIP+tJAZROWCVe0kDByyuxSXr6t+SbjtXr92BU6hYU9Is2ysYvJq+tAzvZA==[/tex]', '[tex=4.071x2.714]wJGaTThFo41W0bFf87CfUuugd6DBIP+tJAZROWCVe0k3ha8hlBbybZyT8s8ZD9wY[/tex]', '[tex=5.214x2.786]wJGaTThFo41W0bFf87CfUuugd6DBIP+tJAZROWCVe0n00A6rPkBtEkEGNuAJ4Kv2LlNnmqaq+eY2/DXNbSUJGQ==[/tex]'], 'type': 102}

级数[tex=4.071x2.714]ySadpvq7BrEZCGdcnD6+aYjvmR43jaUl6Qxu6z0jnz3qizpcinZZTngyPCyXzCaj[/tex][input=type:blank,size:4][/input]（填收敛或发散）．

钻石的密度、折射率、色散率分别是（） A: 3.52；2.417；0.044 B: 3.25；0.044；2.417 C: 3.52；2.147；0.044 D: 3.52；2.714；0.044

下列反常积分中发散的是. 未知类型：{'options': ['[tex=4.786x2.786]wJGaTThFo41W0bFf87CfUpQpy6PKHEKKt/GY0gREDsQAiIfvXB9khuMWm5RQj8AP+b/gjKrw5P/l9hNOhaYIUg==[/tex]', '[tex=4.071x2.714]wJGaTThFo41W0bFf87CfUqX1AFa6hwjNHioYYQIkiOMnwdLL1IujZslPEyTa4WQN[/tex]', '[tex=5.643x2.714]wJGaTThFo41W0bFf87CfUpQpy6PKHEKKt/GY0gREDsSklrOLdfiyBbgphaFAnQpW[/tex]', '[tex=5.214x2.714]qN8fOJEmxCPwE8y3sw7Sc+Xwys7N6QyP9puTQot6LPSAVRiA7mP82csrUoLI9Rsa[/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)

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)