[图] in the general Euler euqation represents the ...
in the general Euler euqation represents the distance between the zero () points, This distance is callled the column's effective length. For the fixed and free-ended column, the effective length is(). For the column fixed at both ends, the effective length is(). For the pin- and fixed-ended column, the effective length().
A、moment, 2L, 0.5L, 0.7L
B、force, 2L, 0.5L, 0.7L
C、deformation, 2L, 0.5L, 0.7L
D、moment, L, 2L, 0.5L