Different RF bands are used in "aeronautical radio, navigation, broadcasting, and personal wireless communication services," according to EHS, while "specific frequencies are designated for industrial, scientific, and medical uses." Radiofrequency energy includes radio waves and microwaves. RF stands for radio frequency, and its radiation is a "nonionizing electromagnetic energy characterized by relatively long wavelength, low frequency, and low photon energy," according to the division of Environment, Health and Safety at Berkeley Lab. "You can push around Cuba. "Because it's China, because we have such a large trade relationship with them," Lenzi said.
This was written in the seventh decade of the 20th century.
( z0 write :ARG1 ( z1 this ) :time ( z2 date-entity :century 7 :century 20 ) )
(z0 / write-01
    :ARG1 (z1 / this)
    :time (z2 / date-entity
              :century 7
              :century 20))
This was written in the seventh decade of the 20th century .
z0 :ARG1 z1
z2 :century 1
z0 :time z2
z2 :century 0