Morse used a dots-and-spaces code for the letters of the alphabet and for numbers. It was later improved to use dashes with dots and spaces. Since then, it has proved its __________________ many times. |
EFFECTIVE |
Прочитайте приведённый ниже текст. Образуйте от слов, напечатанных заглавными буквами в конце строк, обозначенных номерами В11