A点作用有两个力F<sub>1</sub>=8KN ,F<sub>2</sub>=3KN,它们的合力R的大小()
A、等于11KN
B、等于5KN
C、8KN≥R≥3KN
D、11KN≥R≥5KN
A、等于11KN
B、等于5KN
C、8KN≥R≥3KN
D、11KN≥R≥5KN
A、必有F<sub>Rsub>=F<sub>1sub>+F<sub>2sub> B、不可能有F<sub>Rsub>=F<sub>1sub>+F<sub>2sub> C、必有F<sub>Rsub>>F<sub>1sub>,F<sub>Rsub>>F<sub>2sub> D、可能有F<sub>Rsub><F<sub>1sub>,F<sub>Rsub><F<sub>2sub>
A、F<sub>1sub>=6N,F<sub>2sub>=0 B、F<sub>1sub>=0,F<sub>2sub>=6N C、F<sub>1sub>=F<sub>2sub>=8N D、F<sub>1sub>=6N,F<sub>2sub>=8N
A、N次谐波 B、和频与差频 C、f=│±pf<sub>1sub>±qf<sub>2sub>│ 其中p、q=0,1,2,…… D、f=pf<sub>1sub>±f<sub>2sub>和pf<sub>1sub> 其中p=0,1,2,……
A、f<sub>cusub>=1.56F+2.35 B、f<sub>cusub>=2.76F-11.54 C、f<sub>cusub>=1.28F-0.64 D、f<sub>cusub>=2.35+1.38
A、f<sub>cusub>=1.56F+2.35 B、f<sub>cusub>=2.76F-11.54 C、f<sub>cusub>=1.28F-0.64 D、f<sub>cusub>=2.35+1.38
A、f<sub>cusub>=1.56F+2.35 B、f<sub>cusub>=2.76F-11.54 C、f<sub>cusub>=1.28F-0.64 D、f<sub>cusub>=2.35+1.38
A、v<sub>1sub>>v<sub>1sub>>v<sub>3sub> B、a<sub>1sub>>a<sub>2sub>>a<sub>3sub> C、T<sub>1sub><T<sub>2sub><T<sub>3sub> D、F<sub>1sub>=F<sub>2sub>=F<sub>3sub>
A、e<sub>1sub>c<sub>1sub>F<sub>1sub>=e<sub>2sub>c<sub>2sub>F<sub>2sub> B、c<sub>1sub>F<sub>1sub>=c<sub>2sub>F<sub>2sub> C、c<sub>1sub>/c<sub>2sub>=F<sub>2sub>/F<sub>1sub> D、c<sub>1sub>/c<sub>2sub>=F<sub>1sub>/F<sub>2sub>