工频

工 = 二 + 丨 : Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam.

Gitta Giraffe (gu) is working a shift in front of the engine ((e)ng1). Her job is to melt dinosaur bones (丨) so that they can be disposed off easily. To melt the bones, she is shorting a huge capacitor (二) with a steel beam (工) which consequently heats up to a bright glow. Using the glowing hot steel beam she can melt the dinosaur bone easily.

频 = 步 + 页 : Pocahontas (pi) is repeatedly (频) shaking a five-paced viper (步) in the encampment's kitchen ((e)n2). She wants to find out the eigenfrequency (频) of the viper by shaking it at different holding points. She marks her findings on a sheet of paper (页), and next to her she stores a whole stack of papers (页) she already published on the subject.