31. 下列電磁輻射波長由最短到最長之次序應為：
(A) radio waves, infrared, ultraviolet, gamma rays
(B) radio waves, ultraviolet, infrared, gamma rays
(C) gamma rays, radio waves, ultraviolet, infrared
(D) gamma rays, ultraviolet, infrared, radio waves

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統計： A(1), B(0), C(1), D(68), E(0) #1382120