﻿;******英文受信練習*******
;**Constitution of the I.T.U.*****
;****chapter 6 , article 38 , 187-2
hr hr [bt] so far as possible, these channels and installations must be operated by the methods and procedures which practical operating experience has shown to be the best. they must be maintained in proper operating condition and kept abreast of scientific and technical progress. [ar]
