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

下列级数条件收敛的是 未知类型：{'options': ['[tex=5.357x2.714]ySadpvq7BrEZCGdcnD6+aTA5YZwdRnDTPnojmB3KZN0tdZFZjK9MYPrwhu4j4JnBwYqIvWSLq2T3gDe6y4rrpw==[/tex]', '[tex=7.786x2.714]ySadpvq7BrEZCGdcnD6+afwKZbXXc74OEz+XRcPcMmGghabe2gPXETdsIoBG93z9W2UjW8kpZMQn+99l1F7tNw==[/tex]', '[tex=8.643x2.714]ySadpvq7BrEZCGdcnD6+aTXovjPJm4D9KWwaS68tUKZ0JZ/y4JCWu9bXvS5Sy49EkdtalL85eNmBOxWXQxV3VA==[/tex]', '[tex=9.286x2.714]eo4+Or2nRjPO1XMeI9CVMLoiclkG49HrmcWb8B4bWx5m1je3ztF2hThctQEp4RJzAqLoozKr7kKBeJsOU2UZCQ==[/tex]'], 'type': 102}

下列级数条件收敛的是 未知类型：{'options': ['[tex=7.286x2.714]ySadpvq7BrEZCGdcnD6+aTsUuNxYX5FZf6q8x1qck+z0lJqa+3zbT047eyleYFMbcOGoW5JtwqBKFZNmdZUUlw==[/tex]', '[tex=6.214x2.714]ySadpvq7BrEZCGdcnD6+aTXovjPJm4D9KWwaS68tUKYocSkpPWln0x9yljzHFDQ+QL764HP/irP6ASqBy5uFCA==[/tex]', '[tex=5.929x2.714]ySadpvq7BrEZCGdcnD6+aTA5YZwdRnDTPnojmB3KZN2alnUEyaXRDkpBse2kzOrc9qdsSFWl7MpRWyfu8wE7iw==[/tex]', '[tex=5.357x2.714]ySadpvq7BrEZCGdcnD6+aTA5YZwdRnDTPnojmB3KZN0LR9KZ8yumsJcaDjxpYMH+KER1uhCqb4YvukcYdHQ0AQ==[/tex]'], 'type': 102}

下列级数中绝对收敛的是[input=type:blank,size:6][/input] . 未知类型：{'options': ['[tex=5.357x2.714]ySadpvq7BrEZCGdcnD6+aTA5YZwdRnDTPnojmB3KZN1UTVgz+HVuqd4pTif7FugV6pCXniQ+/pAiaylXY0KZqg==[/tex]', '[tex=6.786x2.714]ySadpvq7BrEZCGdcnD6+aSm/7rCnRZEEi5ZomxortdsWJMsLTlMPyKJTs5WOlh/lAiYSz87pikVNQHaUAS4zeQ==[/tex]', '[tex=4.357x2.714]ySadpvq7BrEZCGdcnD6+aTA5YZwdRnDTPnojmB3KZN2llPrlAOhKC5KVnZipLi4q5qbZvjX6/gogg8FO6nBWQQ==[/tex]', '[tex=7.357x2.714]ySadpvq7BrEZCGdcnD6+aTA5YZwdRnDTPnojmB3KZN227rVMEsYWAyUPQzVZ/IqZSVWB/R2sdbAzOiL6MmZHPA==[/tex]'], 'type': 102}

若 [tex=1.857x1.357]bZ4KhrFbnCaidqbMGQZfww==[/tex] 连续且不等于零， [tex=10.786x2.643]JtWnocUX1LsIxki3p94lXhOdMZMbA+6YlcaxhJ9b6TkAupr93Fm1uGJGLYuEjklI[/tex]则 [tex=5.357x2.714]5ASvO95LawEd6MXfgz6wEL3VyOjFpOlhP8pcaJdLNofNFpNHUnqhbxd3t5GOrz9E[/tex] 未知类型：{'options': ['[tex=4.571x2.357]PrPtv0RcxJec1C3TrcP8sWgmV3WK3F7wEjPi05JskxpR2JFzJj2Fo1m8fxIlmvWN[/tex]', '[tex=4.571x2.357]F3AQJrexlYEPh3zxmvpvUBcihE4UJu66LuNHjCpOM7oGBR+uGYpmAwUwW5Iz/08s[/tex]', '[tex=5.5x2.357]waEpZ+u8+s8tupln8rSSU7c6ijRrcuVe1pXC7cP98aEx/MziGpanON8RLbdlu/+yFxnYfmHyVrwaNBiSrukPHw==[/tex]', '[tex=5.5x2.357]p87W4EQzf4K4XCkE+bbgcg36jzDhuYMUt1oe1S3cTartH67W9ry8NfYt+6IdgA/uqszHlpJ/h5pUaZrDs/YIWg==[/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)