某角调波为[tex=17.214x1.571]ZXzLb7giOM0sxanUIJDREhtFVy346+/f6uoYEo46N2bh8rIdbnztTvfWxbDwlhHSYcz+Hy2qBUh84eR9e0NzTwgRpundd7r965SBCK7KErU=[/tex]试确定:最大频偏、最大相移和信号带宽
某角调波为[tex=17.214x1.571]ZXzLb7giOM0sxanUIJDREhtFVy346+/f6uoYEo46N2bh8rIdbnztTvfWxbDwlhHSYcz+Hy2qBUh84eR9e0NzTwgRpundd7r965SBCK7KErU=[/tex]试确定:最大频偏、最大相移和信号带宽
在[tex=10.643x1.429]bD4WTVDijXj/8qTVgD7vLQzlurVHtNsxJPxB/Z3B6gpVdapRsEbFMbSIV8ng2sNH[/tex]介质中, [tex=4.643x1.5]vziuOgbTPriVTqw1I8SwnDWisV1w0GBOotEpUbhzvcI=[/tex]的条件电极电势[tex=7.429x1.571]vfcnJi8LTHLw+l/EPBErECiSCn4+ZIWpBVOTqQbmI/f2OTomkm8qhzhyaSAVW36czyp8/GLhHxToojT98UZrag==[/tex]和其标准电极电势[tex=7.071x1.571]415UJxNb83DWaELlfi/xFV9d/gQTiTYFcJjwvO4Ac2rXhwHo2uXUATkj+bN56QzP[/tex]相比[tex=17.286x1.571]XaLIWUoK1nm38giu1za1MTDRYRO7jNszclU2sEgbMMwfTvi/UX7sn/c1Kc7s4ZXMu/T38T4Ti1OGRGNUcz3c6BV5ADbnzmB5aUX0f70Po8uk9GqI8yO1IG69kRS5W43aGh/HO0M0ZBfiGyF0fREDOw==[/tex][tex=17.214x1.571]WKT8/MCmHQOvRPQVP3ijdXfTF1C92dIpPa2oQ3/pj+jiQ42argFcUr7eJcSCNsoFhGZ55hl28iIJigzy5vaWLgma4UsBcsX78ooUBewWOMPMJ2fvUAE3JhsxV12DcwrvqrcZ1b3f+1GADHVC4n4Hmw==[/tex][tex=17.214x1.571]LUq2jSygCljrYxIGqbasZ3DHP5ETVMKv2Mv98365GHcok8P7dJwOd3n7VKWyUo3rgukKdQhDjOmvasMCI3z7TQ7MC4KOtLm7Kn+PMpKvdoffvaTaQJx90sYIoF1bkSVaG1hC3GVpdX/1S2LAyvg4SA==[/tex]D.无法比较
在[tex=10.643x1.429]bD4WTVDijXj/8qTVgD7vLQzlurVHtNsxJPxB/Z3B6gpVdapRsEbFMbSIV8ng2sNH[/tex]介质中, [tex=4.643x1.5]vziuOgbTPriVTqw1I8SwnDWisV1w0GBOotEpUbhzvcI=[/tex]的条件电极电势[tex=7.429x1.571]vfcnJi8LTHLw+l/EPBErECiSCn4+ZIWpBVOTqQbmI/f2OTomkm8qhzhyaSAVW36czyp8/GLhHxToojT98UZrag==[/tex]和其标准电极电势[tex=7.071x1.571]415UJxNb83DWaELlfi/xFV9d/gQTiTYFcJjwvO4Ac2rXhwHo2uXUATkj+bN56QzP[/tex]相比[tex=17.286x1.571]XaLIWUoK1nm38giu1za1MTDRYRO7jNszclU2sEgbMMwfTvi/UX7sn/c1Kc7s4ZXMu/T38T4Ti1OGRGNUcz3c6BV5ADbnzmB5aUX0f70Po8uk9GqI8yO1IG69kRS5W43aGh/HO0M0ZBfiGyF0fREDOw==[/tex][tex=17.214x1.571]WKT8/MCmHQOvRPQVP3ijdXfTF1C92dIpPa2oQ3/pj+jiQ42argFcUr7eJcSCNsoFhGZ55hl28iIJigzy5vaWLgma4UsBcsX78ooUBewWOMPMJ2fvUAE3JhsxV12DcwrvqrcZ1b3f+1GADHVC4n4Hmw==[/tex][tex=17.214x1.571]LUq2jSygCljrYxIGqbasZ3DHP5ETVMKv2Mv98365GHcok8P7dJwOd3n7VKWyUo3rgukKdQhDjOmvasMCI3z7TQ7MC4KOtLm7Kn+PMpKvdoffvaTaQJx90sYIoF1bkSVaG1hC3GVpdX/1S2LAyvg4SA==[/tex]D.无法比较
某角调波为[tex=17.214x1.571]ZXzLb7giOM0sxanUIJDREhtFVy346+/f6uoYEo46N2bh8rIdbnztTvfWxbDwlhHSYcz+Hy2qBUh84eR9e0NzTwgRpundd7r965SBCK7KErU=[/tex]试确定: 该信号是 [tex=1.643x1.0]cRo4R1BuoSAjAih90mgpbA==[/tex]信号还是[tex=1.643x1.0]HHWYGesjVfCBMm+fIgmVMg==[/tex]信号。
某角调波为[tex=17.214x1.571]ZXzLb7giOM0sxanUIJDREhtFVy346+/f6uoYEo46N2bh8rIdbnztTvfWxbDwlhHSYcz+Hy2qBUh84eR9e0NzTwgRpundd7r965SBCK7KErU=[/tex]试确定: 该信号是 [tex=1.643x1.0]cRo4R1BuoSAjAih90mgpbA==[/tex]信号还是[tex=1.643x1.0]HHWYGesjVfCBMm+fIgmVMg==[/tex]信号。
某角调波为 [tex=17.214x1.571]xR0fhe4515ajDH9O/a24KVu2J9GaPxK8koJXqWYZMmRuxG/QQzx9X43zWLzuMSdYwyzYmz4zrRMkMhVANHy7LK9H1JbBwn6F41f7KwpkRsA=[/tex].(1) 计算其最大频偏、最大相移和带宽;(2) 试确定该信号是 FM 信号还是 PM 信号。
某角调波为 [tex=17.214x1.571]xR0fhe4515ajDH9O/a24KVu2J9GaPxK8koJXqWYZMmRuxG/QQzx9X43zWLzuMSdYwyzYmz4zrRMkMhVANHy7LK9H1JbBwn6F41f7KwpkRsA=[/tex].(1) 计算其最大频偏、最大相移和带宽;(2) 试确定该信号是 FM 信号还是 PM 信号。
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}
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)
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( $x)B(x)
下列式中错误的是: A: (∀x)(A(x)Úp(x)) Û (∀x)A(x)Ú (∀x)p(x) B: ($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( $x)B(x)
判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(¬A(x)∨B(x)) ⇔(∀x)¬( A(x)∧¬B(x) ) ⇔¬(∃x) ( A(x)∧¬B(x) ) ⇔¬( (∃x)A(x)∧(∃x)¬B(x) ) ⇔¬(∃x)A(x)∨¬(∃x)¬B(x) ⇔¬(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)
判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(¬A(x)∨B(x)) ⇔(∀x)¬( A(x)∧¬B(x) ) ⇔¬(∃x) ( A(x)∧¬B(x) ) ⇔¬( (∃x)A(x)∧(∃x)¬B(x) ) ⇔¬(∃x)A(x)∨¬(∃x)¬B(x) ⇔¬(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)
以下谓词公式中,( )不是逻辑有效式。 A: ($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)∧($x) Q(x) D: ("x)(P(x)∧Q(x)) Û ("x) P(x)∧("x) Q(x)
以下谓词公式中,( )不是逻辑有效式。 A: ($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)