In 1H-1H COSY and NOESY, both dimensions correspond to the proton NMR spectra.
In 1H-1H COSY and NOESY, both dimensions correspond to the proton NMR spectra.
The couple wish to live in a cosy little home rather than in a big ________ .
The couple wish to live in a cosy little home rather than in a big ________ .
已知由方程siny+xey=0,确定y是x的函数,则dy/dx的值是:() A: -(e+cosy)/xe B: -e/cosy C: -e/(cosy+xe) D: -cosy/xe
已知由方程siny+xey=0,确定y是x的函数,则dy/dx的值是:() A: -(e+cosy)/xe B: -e/cosy C: -e/(cosy+xe) D: -cosy/xe
已知由方程siny+xey=0,确定y是x的函数,则dy/dx的值是:() A: -(ey+cosy)/xey B: -ey/cosy C: -ey/(cosy+xey) D: -cosy/xey
已知由方程siny+xey=0,确定y是x的函数,则dy/dx的值是:() A: -(ey+cosy)/xey B: -ey/cosy C: -ey/(cosy+xey) D: -cosy/xey
已知由方程siny+xe[sup]y[/]=0,确定y是x的函数,则dy/dx的值是:() A: -(e<sup>y</sup>+cosy)/xe<sup>y</sup> B: -e<sup>y</sup>/cosy C: -e<sup>y</sup>/(cosy+xe<sup>y</sup>) D: -cosy/xe<sup>y</sup>
已知由方程siny+xe[sup]y[/]=0,确定y是x的函数,则dy/dx的值是:() A: -(e<sup>y</sup>+cosy)/xe<sup>y</sup> B: -e<sup>y</sup>/cosy C: -e<sup>y</sup>/(cosy+xe<sup>y</sup>) D: -cosy/xe<sup>y</sup>
sinx等于5分之3,cosy等于13分之12,求cos(x减y)
sinx等于5分之3,cosy等于13分之12,求cos(x减y)
下列方法常用于确定分子立体结构的是 ( ) A: 1H-1H COSY B: HSQC C: HMBC D: ROESY
下列方法常用于确定分子立体结构的是 ( ) A: 1H-1H COSY B: HSQC C: HMBC D: ROESY
可用于判断手性分子构型和构象的是:( ) A: HMQC B: HMBC C: ORD D: DEPT E: 1H-1H COSY
可用于判断手性分子构型和构象的是:( ) A: HMQC B: HMBC C: ORD D: DEPT E: 1H-1H COSY
5.蜗杆传动中,齿面在节点处的相对滑动速度vs=__________。 A: vl /siny B: v1/cosy C: v1/tany D: v1tany
5.蜗杆传动中,齿面在节点处的相对滑动速度vs=__________。 A: vl /siny B: v1/cosy C: v1/tany D: v1tany
【单选题】z=e x siny+ ,则dz=() A. e x cosydx+dy. B. (e x siny )dx+(e x cosy+ )dy. C. (e x cosy )dx+(e x cosy+ )dy. D. (e x siny )dx+(e x cosy+1)dy.
【单选题】z=e x siny+ ,则dz=() A. e x cosydx+dy. B. (e x siny )dx+(e x cosy+ )dy. C. (e x cosy )dx+(e x cosy+ )dy. D. (e x siny )dx+(e x cosy+1)dy.