The unit of coefficient of linear expansion or volume expansion is__________?
The unit of coefficient of linear expansion or volume expansion is__________?A. K
B. K-1
C. K -2
D. none
B. K-1
C. K -2
D. none
A. frictional force
B. gravitational force
C. elastic force
D. centripetal force
A. complex network
B. wheat stone bridge
C. potential divider
D. all of above
A. Plane angle
B. Solid angle
C. Both plane angle and solid angle
D. Neither plane angle nor solid angle
A. refraction
B. polarization
C. interference
D. diffraction
A. the threshold frequency for the metal surface
B. the intensity of incident light
C. the frequency of incident light and work function of the metal surface
D. all of the above
A. 300km
B. 200km
C. 100km
D. 20km