CREATE TABLE table_18772 ("Serial & Branch" FLOAT, "Seaman" TEXT, "Mechanical" TEXT, "Secretariat" TEXT, "Supply" TEXT, "Electrical" TEXT, "Radio Electrical" TEXT, "Regulating" TEXT, "Medical" TEXT)

What are radio electricals when secretariat is wtr i?
SELECT "Radio Electrical" FROM table_18772 WHERE "Secretariat" = 'WTR I'
SELECT "Radio Electrical" FROM "table_18772" WHERE "Secretariat" = 'WTR I'