C为|z|=3的正向,∮_c▒dz/(z^3 (z^10-2) ). A: 1 B: 2 C: 0 D: -1
C为|z|=3的正向,∮_c▒dz/(z^3 (z^10-2) ). A: 1 B: 2 C: 0 D: -1
给定一个完整ORF的DNA序列,如下哪两个突变会导致ORF破坏? ATG GGC CTG TCG ACC CTC GAG CGG GAG CGA CTG TGA A: ATG GGC CTG TCG ACC CTC G-- CGG GAG CGA CTG TGA B: ATG GGC CTG TAG ACC CTC GAG CGG GAG CGA CTG TGA C: ATG GGC CTG TCG ACC CTC GA- --G GAG CGA CTG TGA D: ATG GGC CTG TCG ACC CTC GAG CGG CAG CGA CTG TGA
给定一个完整ORF的DNA序列,如下哪两个突变会导致ORF破坏? ATG GGC CTG TCG ACC CTC GAG CGG GAG CGA CTG TGA A: ATG GGC CTG TCG ACC CTC G-- CGG GAG CGA CTG TGA B: ATG GGC CTG TAG ACC CTC GAG CGG GAG CGA CTG TGA C: ATG GGC CTG TCG ACC CTC GA- --G GAG CGA CTG TGA D: ATG GGC CTG TCG ACC CTC GAG CGG CAG CGA CTG TGA
函数\(z = {x^y}\)的全微分为 A: \(dz = y{x^{y - 1}}dy + {x^y}\ln xdx\) B: \(dz = y{x^{y - 1}}dx + {x^y}dy\) C: \(dz = y{x^{y - 1}}dx + {x^y}\ln xdy\) D: \(dz = y{x^{y - 1}}dy + {x^y}dx\)
函数\(z = {x^y}\)的全微分为 A: \(dz = y{x^{y - 1}}dy + {x^y}\ln xdx\) B: \(dz = y{x^{y - 1}}dx + {x^y}dy\) C: \(dz = y{x^{y - 1}}dx + {x^y}\ln xdy\) D: \(dz = y{x^{y - 1}}dy + {x^y}dx\)
求下列函数的z变换。[tex=3.5x1.5]HKNMSLjGfi1qF491DZ3Ctg==[/tex]
求下列函数的z变换。[tex=3.5x1.5]HKNMSLjGfi1qF491DZ3Ctg==[/tex]
函数\(z = \ln \left( {3x + {y^4}} \right)\)的全微分为 A: \(dz = { { 3 + {y^4}} \over {3x + {y^4}}}dx + { { 3x + 4{y^3}} \over {3x + {y^4}}}dy\) B: \(dz = {3 \over {3x + {y^4}}}dx + { { 4{y^3}} \over {3x + {y^4}}}dy\) C: \(dz = {3 \over {3x + {y^4}}}dy + { { 4{y^3}} \over {3x + {y^4}}}dx\) D: \(dz = {3 \over {3x + {y^4}}}dx - { { 4{y^3}} \over {3x + {y^4}}}dy\)
函数\(z = \ln \left( {3x + {y^4}} \right)\)的全微分为 A: \(dz = { { 3 + {y^4}} \over {3x + {y^4}}}dx + { { 3x + 4{y^3}} \over {3x + {y^4}}}dy\) B: \(dz = {3 \over {3x + {y^4}}}dx + { { 4{y^3}} \over {3x + {y^4}}}dy\) C: \(dz = {3 \over {3x + {y^4}}}dy + { { 4{y^3}} \over {3x + {y^4}}}dx\) D: \(dz = {3 \over {3x + {y^4}}}dx - { { 4{y^3}} \over {3x + {y^4}}}dy\)
(dx/ds)2+(dy/ds)2+(dz/ds)2=1
(dx/ds)2+(dy/ds)2+(dz/ds)2=1
函数z=,则函数的全微分为() A: dz=()dx B: dz=()dy C: dz= ()dx+()dy D: dz=0
函数z=,则函数的全微分为() A: dz=()dx B: dz=()dy C: dz= ()dx+()dy D: dz=0
函数z=ln(1 x2 y2)当x=1, y=2时的全微分dz= .
函数z=ln(1 x2 y2)当x=1, y=2时的全微分dz= .
函数z=ln(1 x2 y2)当x=1, y=2时的全微分dz= .
函数z=ln(1 x2 y2)当x=1, y=2时的全微分dz= .
倒闸操作时,正确的顺序是() A: 先合QS,再合QF;先断QS,再断QF B: 先合QF,再合QS;先断QF,再断QS C: 先合QF,再合QS;先断QS,再断QF D: 先合QS,再合QF;先断QF,再断QS
倒闸操作时,正确的顺序是() A: 先合QS,再合QF;先断QS,再断QF B: 先合QF,再合QS;先断QF,再断QS C: 先合QF,再合QS;先断QS,再断QF D: 先合QS,再合QF;先断QF,再断QS